Adult Sexual Development - Free Essay Example

Sample details Pages: 3 Words: 836 Downloads: 8 Date added: 2017/09/24 Category Advertising Essay Type Narrative essay Tags: Development Essay Did you like this example? Biological Foundations of Adult Sexual Development Christina Parker PSY/340 Biological Psychology Instructor: Rebecca Wilson June 12, 2010 Biological Foundations of Adult Sexual Development How humans develop prenatally Humans start out as a cell that is formed from the mother’s egg and the father’s sperm. The egg and sperm carry 23 single chromosomes each and when fertilization takes place the 23 chromosomes then become paired. â€Å"All genetically normal humans, regardless of their sex, share 22 pairs of chromosomes and only one pair is different† (Wickens, 2005, p. 204). The different pair is the sex chromosomes (X and Y). A female is (X, X) and a male is (X, Y). As the cell develops into a fetus there are several hormones involved. These hormones continue to work throughout the human body as we grow from an infant into an adult. The hormones effect our sexual development and sexuality. Affects of hormones on a fetus As the fetus grows it will phys ically appear gender neutral, but at about 6 week gestation the Y chromosome, if present, will release a chemical called testis-determining factor which causes the internal male sex organs to start forming. If the Y chromosome is not present then this chemical is not released and the internal female sex organs will start to form. The male hormones that cause the external organs to develop are called androgens, without these we would all have female external sex organs (Spencer A. Rathus, 2005). Some of the different androgens are: testosterone, dihydrotestosterone (DHT), and Mullerian inhibiting substance (MIS). If any of these hormones are missing or do not release the amount they are suppose to at the time they are suppose to the fetus will have genetic sexual disorders such as: Klinefelter syndrome, congenital adrenal hyperplasia, pseudo-hermaphrodite, and testicular feminisation syndrome (Wickens, 2005). The lack of these hormones not only affects the physical appearance o f the fetus, but also the sexual behavior as the child grows into an adult. Affects of hormones on a growing child As a child grows and hit puberty hormones come into play again. At puberty the testes and ovaries come under the control of the hypothalamus and the pituitary gland (Wickens, 2005). â€Å"To be more precise, the release of sex hormones begins with the hypothalamus, which secretes gonadotropin-releasing hormone (GnRH), which diffuses through the hypophyseal portal blood vessels to the anterior part of the pituitary† (Wickens, 2005, p. 209). Next GnRH cause the anterior pituitary to release luteinising hormone (LH) and follicle-stimulating hormone (FSH) which are then transported to the gonads. Some other hormones that come onto play are testosterone and estrogen. There are genetic conditions that cause issues during puberty as well as into adulthood. Any of the conditions that were mentioned earlier will have issues during puberty ranging from a lack of mens truation for females and a development of breast in males. Behavior can also be affected by these conditions. Behavior and the adult sexual development As the adolescent moves into adulthood these conditions can also have affects on the behavior. An excess of testosterone can cause increased aggravation. An excess of estrogen can cause an increase in feminization. Not all men behave the way society believes that they should and not all women behave the way society believes that they should. The hormone imbalances during the prenatal stage and puberty as well as some environmental effect can be determined to lead to intersexuality, bisexuality, heterosexuality, and homosexuality. Biological changes in sexual development â€Å"The prediction that sex differences must exist in the human brain comes from at least three different types of observations: men and women (or boys and girls) differ predictably in (1) behavioral traits (e. . , aggression, juvenile play); (2) average cogniti ve abilities; and (3) the incidence of neurological and psychiatric disorders† (In Encyclopedia of the Human Brain, 2002). â€Å"Regardless of whether these differences are due to genes, hormones, socialization, or the confluence of all three, sex differences in behavior, neuropathology, and cognitive performance must be reflected by sex differences present someplace in the nervous system† (In Encyclopedia of the Human Brain, 2002). In the human preoptic area of the hypothalamus there are four nuclei known as the interstitial nuclei of the anterior hypothalamus (INAH 1–4) (Wickens, 2005). There are differences in two of these four nuclei that are associated with sexual differences. INAH 1 and 4 are the same in both males and females. The other two are larger in males, but some homosexual males have had smaller INAH 2 and 3. While it is still controversial the differences in the human brain can either be said to cause homosexuality and other sexual identities o r a result of them. While there are many differences in the human brain such as overall size, â€Å"many sex differences are likely to exist in more subtle features of the brain, such as neural connectivity or neurochemistry† (In Encyclopedia of the Human Brain, 2002). References: In Encyclopedia of the Human Brain. (2002). Retrieved June 10, 2010, from https://www. credoreference. com/entry/esthumanbrain Spencer A. Rathus, J. S. -R. (2005). Human Sexuality in a World of Diversity, sixth edition. Allyn and Bacon, Pearson Education, Inc. Wickens, A. (2005). Foundations of Biopsychology, Second Edition. Prentice-Hall. Don’t waste time! Our writers will create an original "Adult Sexual Development" essay for you Create order

The Field Of Agricultural Biotechnology - 1071 Words

Agricultural Biotechnology Due to the greater understanding of DNA, the field of Agricultural Biotechnology has developed rapidly over the last 30 years. Agricultural Biotechnology is a set of tools to modify products, improve plants and animals, and make microorganism for agricultural uses. It’s being used to produce products cheaper and easy to maintain. More and more farmers and producers used genetic engineered crops because of the price and resistances to insects and diseases. The main aim is to meet human and environmental needs. Biotechnology is a set of tools that uses living organisms to produce or modify a product, improve plants or animals, or develop microorganisms for specific uses. The latest set of tool- some say greatest-is genetic engineering. It allows the transfer of useful characteristics into a plant, animal, or microorganism by inserting genes from another organism. 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Caught in the Night free essay sample

First, Tihanyi describes the â€Å"dabbler†. These people can be seen as occasional users. They spend significantly less time online than other users, just â€Å"a few hours a week† (111). Dabblers use the Internet for a specific purpose. Once that purpose has been achieved, they move onto something else. They also prefer other activities, such as meeting people for lunch or watching television to being online. Next Tihanyi discusses the characteristics of the regulars. She describes how â€Å"regulars visit the Net not just to gain information but to interact with others† (112). They use the Internet for news, shopping, research, and communication. They may find themselves in chat-rooms discussing topics with others who have the same interests. As regulars have several uses for the Internet they tend to spend more time online: â€Å"8—10 hours a week† (111), according to Tihanyi. Finally, Eva Tihanyi uses a metaphor to compare the dabblers and regulars to the addicts: â€Å"They don’t surf the Net, they drown in it† (112). We will write a custom essay sample on Caught in the Night or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page The Internet overwhelms those addicted to it. Tihnayi states that addicts spend â€Å"an average of 38 hours per week† online (112). She describes how they create virtual personalities and live virtual lives, eventually creating disorder in their professional and personal lives and causing unemployment and the breakdown of marriages. Tihanyi states that Internet addiction is â€Å"the first official mental health disorder associated with computers† (113). In conclusion, Tihanyi explains that we can’t be completely satisfied by virtual reality; people will always prefer â€Å"an actual pizza over a virtual one† (113). The Internet clearly has its limits when it comes to pizza and, as well, some people still prefer a social gathering over messaging in a chat-room. Although nearly everyone uses the internet and will continue to do so in the future, Eva Tihanyi shows we all use it to a different extent. According to Tihanyi, it’s how we use it and how often that tells us what type of user we are.