Human Fertilisation and Development

Human Fertilisation and Development Each day cute little babies are born into this world and being dazzled by their beauty we forget all about the long complicating process that took place which made it possible to have a baby. Therefore in my essay I am going to discuss the human reproductive cell, fertilisation and the development of a human life. Humans reproduce sexually, with both parents contributing half of the genetic makeup of their offspring via sex cells or gametes.Gametes produced by the male parent through Spermatogenesis process are called spermatozoa (commonly called sperm cells) and gametes produced by females through Oogenesis process are called oocytes (commonly referred to as ova or eggs). As gametes are formed, the 46 chromosomes from each parent cell (23 pairs of chromosomes) are divided through meiosis so that each gamete is haploid, having only 23 unpaired chromosomes. Spermatozoa, produced by males, contain a 23rd chromosome that is either an X chromosome (fem ale) or the analogous Y chromosome (male), making each sperm cell either female or male.Spermatozoa have a head that contains a nucleus, a mid piece that contains mitochondria, and a tail with its end piece. Sperm cells produced in the testes move to the epididymis, a coiled tube at the base of the penis where they are stored and matured. During ejaculation, or the ejection of sperm from the penis during orgasm, sperm travel from the epididymis through a long tube called the vas deferens to the urethra. This single tube, which extends from the bladder to the tip of the penis, is also the means by which urine passes out of the body. Liquid secretions from various glands combine with sperm to form the semen, or seminal fluid.Ejaculated semen may contain as many as 400 million sperm. Oocytes are also haploid, and since they are formed only by females, the 23rd chromosome can only be an X chromosome. Each oocyte is protected by several layers of granulosa cells called the corona radiata . Beneath the corona radiata lays the zona pellucida which is involved in binding the sperm cell, and through which the sperm cell must also penetrate prior to fertilization. The nucleus in an oocyte is called the germinal vessicel, and the nucleolus is referred to as the germinal spot. Eggs are produced in the ovaries, oval-shaped organs in the groin that also generate sex hormones.At birth, a female's ovaries contain hundreds of thousands of undeveloped eggs, each surrounded by a group of cells to form a follicle, or sac; however, only about 360-480 follicles reach full maturity. During puberty the action of hormones causes several follicles to develop each month. Normally, just one follicle fully matures, rupturing and releasing an ovum through the ovary wall in a process called ovulation. The mature egg enters one of the paired fallopian tubes, where it may be fertilized by a sperm and move on to the uterus to develop into a fetus.The lining of the uterus, called the endometrium , prepares for pregnancy each month by thickening, but if fertilization does not take place, the endometrium is shed during menstruation. The development of a human begins with fertilization, a process by which the spermatozoan from the male and the oocyte from the female unite to give rise to a new organism, the zygote. During sexual intercourse, a man releases approximately 300 million sperm into a woman's vagina, but only one of the sperm can fertilize the ovum.The successful sperm cell must enter the uterus, swim up the fallopian tube to meet the ovum, and then pass through a thick coating, known as the zona pellucida, that surrounds the egg. The head of the sperm cell contains enzymes that break through the zona pellucida and allow the sperm to penetrate the egg. Once the head of the sperm is inside the egg, the tail falls off, and the outside of the egg thickens to prevent another sperm from entering, and the fertilized egg (zygote) develops into an embryo. The embryo is now a hollow sphere of cells called a blastocyst.The blastocyst implants itself in the uterine wall. Gastrulation occurs in which cells migrate inward and form a rudimentary digestive cavity. The resulting gastrula has three layers of cells. After gastrulation the three embryonic tissue layers give rise to specific organ systems. Tissues and organs take shape in a developing embryo as a result of cell shape changes, cell migration and programmed cell death. In a process called induction, adjacent cells and cell layers influence each other’s differentiation via chemical signals.Pattern formation, the emergence of the parts of a structure in their correct relative positions, involves the response of genes to spatial variations of chemicals in the embryo. Meanwhile, the four extra embryonic membranes develop: the amnion, the chorion the yolk sac, and the allantois. The embryo floats in the fluid-filled amniotic cavity, while the chorion and embryonic mesoderm form the embryo’s part of the placenta. The placenta’s chorionic villi absorb food and oxygen from the mother’s blood.Human embryonic development is divided into three trimesters of about 3 months each. During the first trimester the embryo begins to develop all vital organs of the baby and by 9 weeks shows a fetus. The fetus looks like a miniature human, although its head is still oversized for the rest of the body. During the second trimester, the fetus continues growing and developing. Its arms, legs, fingers and toes have lengthened. It has the face of an infant with eyebrows and eyelashes. It develops fingernails and toenails and is covered with fine hair.And also it begins to move, kick and open and closes its eye and its teeth are forming. During the third trimester, the fetus gains the strength it will need to survive outside the protective environment of the uterus. The fetus circulatory system undergoes changes that will allow the switch to air breathing and it continues to g row adding layers of fat, bones begin to harden and its muscles thicken. It also loses much of its fine hairs, except on its head and the head changes its proportion. Finishing development is underway preparing for birth.Hormonal changes induce birth; estrogen makes the uterus more sensitive to oxytocins, which acts the prostagland into initiate labor. The cervix dilates, the baby is expelled by strong muscular contractions, and the placenta follows. To conclude, life begins when male and female gametes unite during fertilisation. The embryo develops into a fetus in the mother’s womb and after the three trimesters of growing and developing, the mother cuddles her new born baby boy or girl in her arms which puts a smile on her face.

African Islamic movement in the United States Essay

African Islamic movement in the United States - Essay Example Islam has deep origins in the African-American practice of religion, roots that can be traced back to the period of slavery and early 20th century black Sunni communities in the United States. Islam played a greatly encouraging and ideological role in the evolution of a distinct African-American identity This study will outline the spiritual, ideological and psychological way for tracing the course of Islamic expansion within the United States and how has the matter of race in the United States influenced the practices and the community experiences of black Sunni Muslims who conventionally see Islam as a color and race-blind religion.Malcolm X's Hajj in 1964 and Warith Deen Mohammed's transformation of the Nation of Islam into an orthodox community in 1975 are two of the more recent visible signs of the importance of mainstream Islam in the African-American experience (American Black Islam, 1989). African Americans comprise about 42% of the Muslim population in the United States, whi ch conservatively is somewhere between four to six million; and Sunni African-American Muslims are the predominant community in the United States today.Muslim slaves-involuntary settlers, who had been the urban-ruling elite in West Africa - comprised at least 15% of the slave populace in North America in the 18th and 19th centuries. Their spiritual and racial roots could be tracked to ancient black Islamic monarchy in Ghana, Mali, and Sohghay. Some of these West African Muslim slaves brought the first mainstream Islamic beliefs and practices to America by keeping Islamic names, writing in Arabic, fasting during the month of Ramadan, praying five times a day, wearing Muslim clothing, and writing and reciting the Qur'an (McCloud, 1995). By the end of the Civil War, the old Islam of the West African Muslim slaves was for all realistic purposes obsolete, because these Muslims were not able to develop community establishment to maintain their faith. When they died, their version of Islam, which was African-American, personal, and with conventional and unorthodox practices disappeared. Early 20th-Century Mainstream Communities In the late 19th and early 20th centuries, the Pro-Africanist ideas of Edward Wilmot Blyden (1832-1912), which criticized Christianity for its racial discrimination and recommended Islam as a feasible alternative faith for African Americans, offered the political agenda for Islam's influence on black Americans. Furthermore, the global outlook of Marcus Garvey's Universal Negro Improvement Association and the Great relocation of more than one million black southerners to northern and Midwestern cities during the World War I era offered the social and political background for the emergence of African-American mainstream communities from the 1920s to the 1940s. The Ahmadiyya Movement in Islam, an unorthodox disciple community from India, set the foundation for conventional Islam in Black America, by imparting African Americans with their first Qur'an, significant Islamic literature and culture, and association to the mainstream world of Islam. Black Sunni Muslims can track their ancestry in the United States in the early 20th century to two multi-ethnic communities: the Islamic Mission of America, led by Shaykh Daoud Ahmed Faisal in New York City, and the First Mosque of Pittsburgh (Marsh, 1984). Shaykh Daoud, was born in Morocco and migrated to the United States from Grenada. He was greatly influenced by the Muslim migrant societies, by Muslim sailors from Yemen, Somalia, and Madagascar, and by the Ahmadi version of the Qur'an. He established the Islamic Mission of America, also known as the State Street Mosque, in New York City in 1924. This was the first African-American conventional muslim community in the United States. The president of the Muslim Ladies Cultural Society was none other than Shaykh Daoud' s wife, "Mother" Khadijah Faisal, who possessed Pakistani Muslim and black Caribbean ancestry. The Islamic

EPISODIC and Analysis Essay Example | Topics and Well Written Essays - 1250 words - 1

EPISODIC and Analysis - Essay Example He is also complaining of shortness in breath, stuff nose and persistence of cough. On the other hand, T.M. denied smoking cigarettes, taking prohibited drugs and drinking alcoholic beverages. He has no allergic reactions to any food, any drug or medication, or any environmental factors. As a patient, he had not complained of pains or of any past hospitalizations. But he is sexually active and had undergone AIDS test. His two other brothers also tested negative of the AIDS test last year. He has had vaccination for milestones completed. He had no previous medications taken or OTC drugs. His parents are positive for hypertension. This seventeen (17) years old African American male was a mesomorph. His physique could be characterized to be predominantly muscular. He was alert being very much aware of his surroundings when he was oriented three times. He had low grade fever at 990F. This was way below the margin of 100.40F or 380C. He was positive for adenopathy for some swelling on the perineal area because of the yellow perineal discharge present. However, he does not have inflamed eyes. He had also no visible wounds, not even rectal rashes. His lungs were clear. This means his respiration was normal. His heart rate was normal at P: 58; RR: 18; T: 99.1 and BP is 139/91. Finally, his nose drainage was clear, but, his voice was hoarse (+). Subsequently, the following plan was designed and suggested for an assessment of the patient after consulting with school clinic: 1) Gonorrhea/ Chlamydia Test – for Urethral Infection – a Non-culture detection of N. gonorrhea – b. Culture positive for N. gonorrhea, with or without confirmation tests; 2.) Test for Rectal/Pharyngeal Infection; 3.) Test for HIV from the patient’s blood collected sample; 4.) DNA probe test must be done to rule out Chlamydia; 5.) Immunodiagnostic test must be done for the antigen-antibody reaction (Engelkirk and Burton, 2007); 6.) For medication, the patient must take: Rocephin 125mg

Discussion 1 Essay Example | Topics and Well Written Essays - 500 words

Discussion 1 - Essay Example The source of the issue is then used as a means to determine the possible solutions. This may include a wide range of techniques like job or task analysis (Castagnolo, 2007). Here the output from this phase generally provides the instructional goals and these are used as a start for the design phase. b) Design: This stage is based of the analysis stage and here this stage involves the development of the plans to reach the instructional goals. This stage involves a number of activities like the selection of delivery systems, learning analysis, population description and also listing out of the objectives. c) Develop: The third phase of the model is the development stage. Here the focus is on development of the instructions and also use of various media and documentation to help develop the plans. This stage involves activities like generation of the lesson plans and also lesson materials. d) Implement: This stage as the name suggests is the actual delivery of the instructions. Several activities can be involved here including different mediums of instructions like classroom learning, lab based or computer based learning. e) Evaluation: Finally the last stage of the model is the evaluation stage. Here this occurs among all the phases and even between phases. This stage can be divided into two main phases. Formative Evaluation and Summative Evaluation. The first form is done during the ongoing and between phases, while the summative evaluation occurs during the finals element of the implementation. The activities that are included here are the decision making processes like whether or not the instructional package should be bought, if it should be continued or discontinued. The most essential stage among the above mentioned stages is the analysis and the evaluation stages. The analysis stage is the most essential as it brings out the overall scope and goals and also brings out the changes needed. Any

English Essay Example | Topics and Well Written Essays - 500 words - 48

English - Essay Example Then it gives a list of the site’s contents that also is the steps that you need to take to write a paper. These steps are decide on a topic, prepare an outline or diagram of your ideas, write your thesis statement, write the body with subheadings on how to do that, write the introduction, write the conclusion and add the finishing touches. This site is intended for ESL learners to help them improve their reading skills, but it can be used by native speakers who want help, too. The site offers several famous texts that you can read through to practice reading skills. What makes this better from just reading by yourself is that these are followed by vocabulary lists, vocabulary quizzes, comprehension quizzes and comments. It also makes graded papers available so that users can see where students have made their mistakes. This helps to make the uses of English understandable. This site is a grouping of lessons related to English grammar. There are six major sections. These are titled word and sentence level, paragraph level, essay and research paper level, ask grammar/search devices, peripherals and power points and grammarpoll/awards. Each section has a list of submenus that are appropriate to the main menu and are all designed to help users learn better

Electrical computer Engineering Essay Example | Topics and Well Written Essays - 1250 words

Electrical computer Engineering - Essay Example article and give my opinion on possible impact of software technology in smuggling of message in the society today. Moreover, I will research for two other articles that relates to the same technology and provide supplementary information that the article highlights for the same technology. Mazurczyk et al. introduces the article using one of the crimes committed by Russian spies in the United States using computer’s software. However, United States people assumed the Russians to be ordinary US residents but turned out to be spies of Russian Foreign Intelligence Service. Mazurczyk indicated that the spies’ mission was to gather information about the United States policies and programs (2013). Thus, for many years, the spies prevented discovery by hiding secret communication on apparently acquitted pictures posted on public websites. Thus, the spies encoded and decoded the information gathered using personalized software. However, the United States Department of Justice detected the spies’ schemes, helping the United States build a case against Russian spies. Thus, in June 2010, the federal government in United States arrested ten suspected spies who owned up to the act of smuggling information. Therefore, steganography is the technique that openly conceals data by use of invisible ink, shrunken text, and tactically placed tattoos. The method used by Russian spies, termed as picture steganography, was old-fashioned method that was easy to detected and used as evidence. However, the modern method of steganography used of networks, which hides information communicated in seemingly internet traffic. Since network steganography uses short delivery channels like Voice over Internet Protocol, the communications in the program is hard to detect. Mazurczyk indicated that most hackers, journalist, and even government use network steganography to communicate secret information. Although, network steganography is hard to detect, Network Security Group at Warsaw University of Technology focuses to help security experts in devising designs for better guard of steganography. Therefore, as communication technology advances in the world, other steganography experts must develop advanced steganography techniques to curb against information smuggling. Mazurczyk posits that most sophisticated methods today target internet services such as search tools, social network, and file transfer systems (2013). Therefore, quick advancement in technology in today’s society perpetrated increasing smuggling of messages especially through networks. Therefore, smuggling of messages is something that happens daily over computer technological devices especially the internet. Remarkably, network steganography allows information communicated read only by the sender and intended message recipient. Smuggling of messages through internet is on the rise in the society. Terrorists, criminals, hackers, and child pornographers could use steganography to sm uggle information. Thus, this poses a threat to the society. Smuggling of messages through steganography, leads to attacks of a country’s internal security without notice. Generally, steganography has become a threat to a county’s internal security. For instance, the Russian spies who were on a mission in dispatching United States policies and program used to hide information

Studying the Philosophical Thoughts Essay Example for Free

Studying the Philosophical Thoughts Essay 1. Generalizing the conditions which form the philosophical thoughts of Chuang Tzu. Regarding the socio-economic conditions: Chuang Tzu lived in the Warring States Period. This period witnessed the increasing popularity of iron tools marked a revolutionary innovation of production tools and the development of social productive. Agriculture, industry and economy also developed during the Warring States Period. Feudal relations of production gradually formed, consequently when the Warring States period started, it marked the end of mode at the slavery which following a pattern of the Orient. The era of Warring States is trouble times. The great transformation of all aspects in this period has left many stamps which affect every fields of life and set out the philosophical problems for the time. Regarding the premise thoughts: Chuang Tzu lived in a period corresponding to the philosophical summit of Chinese thought — the Hundred Schools of Thought. It is also known as the Golden Age of Chinese philosophy because a broad range of thoughts and ideas were developed and discussed freely. Living in the most developed period of the Chinese philosophy, Chuang Tzu can know all the philosophies in The Warring States, except Han Fei’s theory. Living during the chaos, the philosophical thoughts of Chuang Tzu inevitably influenced by the History of Chinese’s thoughts at this time. Short introduction about Chuang Tzu and Nan Hua Zhen Jing Chuang Tzu came from the Town of Meng (in modern Anhui) in Song Dynasty, living in the time of King Hui of Liang and Kinh Xuan of Qi (late 4th century BCE). He is the typical philosopher for Daojia, one of the greatest philosophers in History of Ancient – Middle Age Chinese Philosophy. Chuang Tzu is considered to follow Lao Tzu’s doctrine of Dao, making it develop more bright and popular. He is a minor official in the town. However, he gave up his appointment and lived recluse for the rest of his life at Nan Hua Mountain in the state of Song. In this place, he wrote Nan Hua Zhen Jing. Nan Hua Zhen Jing (also known as The book of Chuang Tzu) is only work of Chuang Tzu that today we still know. This work was lost several time, recovered and then lost again. So it has some inevitable errors. This work, in its current shape consisting of 33 chapters, is traditionally divided into three parts: the first, known as the Inner Chapters, consists of the first seven chapters; the second, known as the Outer Chapters, consist of the next 15 chapters; the last, known as the Mixed Chapters, consist of the remaining 11 chapters. Chuang Tzu was renowned for his brilliant wordplay and use of parables to put forward his philosophical thoughts. Nan Hua Zhen Jing was translated into Vietnamese. The popular translators of Nan Hua Zhen Jing in Vietnam are Thu Giang – Duy Can Nguyen, Hien Le Nguyen, Tong Nhuong, Ton Nhan Nguyen. In my report, I read and quoted the translation of Hien Le Nguyen. 2. Some philosophical thoughts of Chuang Tzu in Nan Hua Zhen Jing World outlook of Chuang Tzu: The inheritance and development of Lao Tzu’s doctrine in the concept Dao. Chuang Tzu advocated that the primary sources of whole world is nothing. He found that everything in this world has the common origin which is called Dao, even though they have many differences. In Chuang Tzu’s conceptions, Dao is formless, unknown, empty, and it is beyond space, time, life and death. Dao is â€Å"non-material† so that no one gave it birth and it derived from itself. That means Dao had before heaven and earth. So Dao is the origin of universe. Chuang Tzu said that Dao constantly changes. Everything in this world always moves and transforms, and we don’t know where they start, how they end. However, they change follow the set of strict rules and have the natural power. Everything contains Dao as their nature. All are transformed by Dao of their own to suit different circumstances. This is the core of Chuang Tzu’s conception about Dao which represents the development of Lao Tzu’s doctrine to a new level. Epistemology of Chuang Tzu: Relativism. For knowledge, like Lao Tzu, Chuang Tzu didn’t respect intellectual. He considers that intellectual knowledge is redundant because it will bring troubles. Chuang Tzu said: â€Å"There are limits in our lives, but there are no limits to knowledge. Using the limited thing to catch up with the unlimited thing can only bring troubles. Someone who already thinks they’re knowledgeable is really in trouble. † (Chapter 3, â€Å"Opinions on Nurturing Life†). Thus, he doesn’t encourage people to accumulate knowledge and opposes to argue with words. For Chuang Tzu, Dao is the supreme principle. He emphasized the absolute movement and ignored the stabilization. Chuang Tzu pushed the conception about relativity of Chuang Tzu into relativism. He advocated that there are no right and wrong, wealthy and poverty; no intellect, no arguments. Outlook on life of Chuang Tzu: Happiness is absolute freedom and absolute equality. *According to Chuang Tzu, the first of all happiness is lived freely follow natural essence, reaching the carefree roaming in this life. Philosophical thoughts of Chuang Tzu show us that wealthy or poverty, right or wrong, big or small, etc have no meaning at all. It is important that you have a happy life, reach to the carefree roaming, don’t you? Chuang Tzu mentioned that if we want to get the absolute freedom, we will have to live follow our natural essences. To do this, we need to expand our vision, do not set up obstacles for yourself. The carefree roaming requires human life keep pace with all things in the world from the heart, eyes and breath to action rather than antagonistic, requiring as sovereign of the universe. Happiness can really get in this world is encumbered with nothing inside. It sounds simple but is very difficult. It requires us to open eyes to perceive Dao everywhere, and everyone is encouraged to expand their mind by their experiences. We often spend a lifetime to explore the outside world, so we are losing the power to recognize the inner strength of ourselves. To reach the carefree roaming, we need to follow the natural essence, come back to the natural, rustic, carefree, liberated life. *The second is known how to make all things equal. Chuang Tzu said that to achieve the absolute Dao, the first step is that people need to remove their conceptions about right and wrong, considering the difference between things in this world is relative, in other words, it makes all things be equal. *Conception of Chuang Tzu about the true man and the true society. For Chuang Tzu, A true person has to be a carefree person. He said: â€Å"What is a true person? The true person of ancient times wasnt opposed to the idea of being different than the rest of society, didnt try to be macho, and didnt plan for a lucrative career. Someone like that could move from one situation to another with no regret, and measure up her self worth without becoming smugly self-satisfied. Someone like that could climb to dizzying heights without trembling in fear, enter water without feeling wet, and enter fire without feeling the heat. This kind of perception enables one to ascend on the tails of Dao. The true person of ancient times could sleep without dreaming, could awaken without anxiety, could eat food without relishing in it, and could completely fill her lungs when breathing. A true person breathed all the way down to her heels, while other peoples breath only filled the top of their lungs. Those who bend over in submission seem to spew forth words from their mouths like vomit. Those who harbor old desires deeply within them leave only a shallow space for the heavens to maneuver. The true person of ancient times wasnt aware of expressing joy in life, nor of feeling aversion to death. He didnt feel a need to be gracious when he left, nor did he feel a need to be aloof when he entered. He could leave as swiftly as he arrived, and there was nothing more to it. He didnt forget where he began, but didnt question where hed end up. He celebrated what was received, and recaptured what had been forgotten. This is called not using the mind to contribute to Dao, and not using people to assist the heavens. Thats what was called a true person. † (Chapter 6, â€Å"The Great and Most Honored Master†) Chuang Tzu said the world â€Å"does no need governing; in fact it should not be governed†, and, â€Å"Good order results spontaneously when things are let alone. † Murray Rothbard called him â€Å"perhaps the world’s first anarchist†. * Nan Hoa Zhen Jing of Chuang Tzu has high value philosophy and value artist. In this book, Inner Chapter is contained the most of his philosophical thoughts such as world outlook, epistemology, outlook on life, etc. It showed us that Chuang Tzu’s thoughts thought is not much, but deep, profound and mysterious.