’s Sex Essay, Research Paper
The Hormones and Development of One’s Sex
The objectives of this article as I saw them were, (1) to show how fetal gonads
acquire the ability to function as endocrine organs, and (2), to show the
mechanisms by which the endocrine secretions modulate male development. The
researchers went through an extremely extensive explanation of the formation of
the sexual phenotypes by detailing the development of germ cells. They
explained how women’s and men’s gonads appear identical until Leydig cells,
which synthesize testosterone, appear in the connective tissue. This is when
differentiation begins.
The mechanism that this differentiation occurs is as follows. There are two
duct systems which are basically sex specific. In men, Wolffian ducts are
dominant and Mullerian ducts are regressive. Whereas in women it is just the
opposite. Jost believed that the fetal testis secret a hormone which causes such
a differentiation. In order to confirm this belief, he removed the gonads from
embryos, prior to the onset of phenotypic differentiation. All resulted in
female phenotypes. The male phenotype is induced and will not manifest if the
proper secretions are not made from the testis.
Although the article fails to mention how, “Jost deduced that two secretions
from the fetal testis are essential for male development – Mullerian-inhibiting
substance and androgen.” The mechanism in which spermatogenic tubules form
Mullerian-inhibiting substance is still unclear to scientists. Problems with
improper levels of this hormone result in genetic and phenotypic reproductive
disorders.
The other hormone secreted by the testis is testosterone. It has two functions;
it promotes maturation of the spermatogenic tubules (and is therefore indirectly
effecting the levels of Mullerian-inhibiting substance), and it has its well
known essential role in the development of the male genital tract.
Throughout this article there were several areas where it seemed to me, issues
were unresolved, however seemed to me that we have the technology to resolve
them. For instance “The Character of the acceptor sites within the nucleus
(that is, whether protein or DNA) and their number are not resolved.” Couldn’t
one do a radioactive trace or a non-vital stain of some sort to distinguish the
protein from the DNA.
The development of one’s sex is therefore far more than just a genetic decision,
it is (once again) a complex cascade of hormones acting on receptors. These
receptors go on to activate effector molecules which activate target molecules.
If at any point this system is disrupted in any way, one either has the
underdevelopment or incorrect development of the phenotypical gonadal
characteristics.
Другие работы по теме:
Biology Of Depression Essay Research Paper Depression
Biology Of Depression Essay, Research Paper Depression is a common illness that inflicts millions of people worldwide. Although the causes are still being determined, growing evidence has lead scientist to conclude that biochemicals in the brain such as serotonin, hormones, and other factors lead to depression.
Personality Essay Research Paper Freud Piaget Erikson
Personality Essay, Research Paper Freud, Piaget, Erikson, and Maslow are the last name of prominent psychologists. They have all gone to great lengths to develop their own unique theories. The theories that they have created, pertaining to personality, happen to be the four best-known theories of personality growth.
Nurture Vs Nature Essay Research Paper The
Nurture Vs. Nature Essay, Research Paper The human brain is a portion of the central nervous system and serves as the control center for movement, sleep, hunger, and virtually everything else vital and necessary to survive. Not only that, but the brain also controls all human emotions from fear and love, to elation and sorrow.
The Design And Development Of My Circuit
Was A Task That Merged Into One Essay, Research Paper The design and development of my circuit was a task that merged into one. This is because in order to design a circuit to follow such
Diabetes Essay Research Paper Diabetes Insipidus rare
Diabetes Essay, Research Paper Diabetes Insipidus, rare disease caused by deficiency of vasopressin, one of the hormones of the posterior pituitary gland, which controls the amount of urine secreted by the kidneys. The symptoms of diabetes insipidus are marked thirst and the excretion of large quantities of urine, as much as 4 to 10 liters a day.
Female Menstruation Essay Research Paper Puberty
Female Menstruation Essay, Research Paper Puberty – The arrival of the monthly friend . The principle sign that a girl has become sexually mature and is capable of reproduction is the onset of menstruation, a period of cyclic bleeding from the vagina. (Smith 1997, pg 217) This is one of the key physiological functions of the female body.
Information About Transgenic Organisms Essay Research Paper
Transgenic Organism, plant, animal, or bacteria that has been genetically modified to contain a gene from a different species. The new gene is inherited by offspring in the same way as the organism’s own genes. The transgenic condition is achieved by injecting the foreign gene into the fertilized egg or into embryonic cells.
Beef Essay Research Paper What is Europe
Beef Essay, Research Paper What is Europe’s Beef About Our Beef? Right now Europe is fighting for the right to refuse to import beef from the U.S. and Canada that has been grown with the aid of artificial hormones. The purpose of these hormones is to force the livestock to grow in a rapid, unnatural way. Beef has been grown this way in North America for some time, and is sold with no special labeling.
Pituitary Dwarfism Essay Research Paper The Pituitary
Pituitary Dwarfism Essay, Research Paper The Pituitary Gland is situated at the base of the brain and it produces hormones which control growth. Too large an amount of these hormones causes giantism, a condition where facial features, hands, etc. become abnormally large. Too little causes dwarfism, where the overall stature of a person is very small.
Plant Hormones In Agriculture Essay Research Paper
The Role of Hormones in Plants The majority of people know that hormones play a vital and important part in animal growth and development. The common layperson knows that without certain chemicals in their bodies, they would not function right. An example of a hormonal problem would be in the case of a dwarf in which a person does not produce enough growth hormone and grows only to a small height.
Adolescence And Moral Development Essay Research Paper
Adolescence and Moral Development Two major reasons exist for studying moral development and during adolescence. First, congnitive changes that occur during adolescence are related to moral develpment. formal operational thinking allows the adolescent to interpret the social environment in new and different ways.
Investigation Of Reproduction And Development In Animals
Essay, Research Paper Investigation of Reproduction and Development in Animals Due Date: 12/9/96 Cycles, Conception and Contraception Fertility is the condition of being fertile. The aim of contraception is to inhibit fertility in individuals, hence, slowing population growth. The system by which all female contraception must operate: the menstrual cycle.
Geographic Features Of A Region Has Important
Effects On Development Essay, Research Paper Geographic Features of A Region Has Important Effects on Development The geographic features of a nation or region have an important effect
Prostate Cancer Essay Research Paper Moiz BhinderwalaClass
Prostate Cancer Essay, Research Paper Moiz Bhinderwala Class A, Mr. Haight What is cancer of the prostate? Cancer of the prostate, a common form of cancer, is a disease in which cancer (malignant) cells are found in the prostate. The prostate is one of the male sex glands and is located just below the bladder and in front of the rectum.
Causes Of Homosexuality Essay Research Paper This
Causes Of Homosexuality Essay, Research Paper This article attempts to identify the biological causes of homosexuality. The article introduces the different ideas that many different scientists and psychologists have about the causes of homosexuality. One idea focuses on one of the most obscure features that distinguish the two sexes- how our inner ears respond to clicking sounds.
Steroids Essay Research Paper SteroidsSteroids are groups
Steroids Essay, Research Paper ?Steroids? Steroids are groups of natural chemicals, which include fat and all the things fat can break down in the body?s system. From this break down, the body then can be ?boosted? and a human being can do things that most people consider physically impossible. Steroids also affects the mind. ??What is found in Steroids are certain alcohols (or sterols), bile acids, many important hormones, some natural drugs, and the poisons found in the skin of some toads?
Heart Attacks Essay Research Paper Heart Attacks
Heart Attacks Essay, Research Paper Heart Attacks Heart attacks are the leading cause of death in the United States. Everyday approximately 1,500 people die from heart attacks. Thousands more
Puberty Essay Research Paper Up until the
Puberty Essay, Research Paper Up until the age of nine or ten years, there is little difference in the physical appearance of a boy or a girl, except the genitals. Boys and girls behave differently but this is mostly as a result of ’socialisation’ or the way other people have molded the child to behave like a girl or like a boy.
Responses To Aggression In Man Essay Research
Paper CHAPTER 3 The instinctive aggression does not means that it is related either to the Darwinian theories or genetically heritable. But it definitely is seen in particular stage of social development. This development does not mean the positive development but it means the wrong education that we inherited from our ancestors, which I have mentioned before.
Cancer Essay Research Paper Prostate cancer is
Cancer Essay, Research Paper Prostate cancer is cancer of the prostate gland. The prostate is part of the male reproductive system. This gland is locates inside the body at the base of the penis, just below the bladder and in front of the rectum. It is composed of the glandular and fibrous tissue enclosed in a capsule of connective tissue.
Career Development Model Essay Research Paper Career
Career Development Model Essay, Research Paper Career Development The Career Development Model is a step-by-step plan that helps you effectively plan your career and allows you to make decisions based on a large database of information you have collected concerning your future career. In this model there are three stages that one should follow to achieve an accurate picture of where you want to go with your future.
Human Growth Hormone Essay Research Paper Human
Human Growth Hormone Essay, Research Paper Human Growth Hormone Human Growth Hormone is a chemical formula that prevents biological aging. To most people, the only thing known to do the same as HGH is “the fountain of youth”. HGH is one of many endocrine hormones found in the human anotomy, like estrogen, progestorene, testosterone, melatonin and DHEA, which decline in production with age.
Dangers Of Anabolic Steroids Essay Research Paper 2
Dangers Of Anabolic Steroids- Essay, Research Paper Dangers of Anabolic Steroids- In the past three decades, steroids has been becoming a serious problem more than ever in the athletic field. Steroids are
Steroids Essay Research Paper SteroidsIn the past
Steroids Essay, Research Paper Steroids In the past three decades, steroids have become a serious problem more than ever, especially in the athletic field. Steroids are an anabolic drug used to build growth hormones that include the androgens (male sex hormones), principally testosterone, estrogen, and progestogens (female sex hormones).
Freud Essay Research Paper Freud
Freud Essay, Research Paper Freud’s Personality Theory The development of gender roles in deifferent forms of feminsm gives us a revealing overview of Freud’s personality theory. It is relatively
Child Development Essay Research Paper I really
Child Development Essay, Research Paper I really enjoyed reading about cognitive and social development in infancy, I can relate to it after being around my nephew and niece when they were going
The Biology Of Identity Essay Research Paper
THE BIOLOGY OF IDENTITY (In hopes to find the TRUTH behind sexual anomalies ) Without having any value judgments on sexual deviancy – the word itself many seem to imply disapproval. Whether it be transvestism, voyeurism, exhibitionism, or sadomasochism, sexual deviancy is by many considered unnatural and inhuman.