Spermatogenesis Essays

Spermatogenesis, the sequence of events occurring in the male testes that produces or develops mature spermatozoa, begins and continues after the male reaches reproductive maturity, which is around 14 years of age, and this process of the production of spermatozoa continues throughout the male’s life. Spermatogenesis occurs under the control of hormones from the brain and from the endocrine cells in the testes, and the lack or insufficiency of one or more of these hormones can cause infertility or

3. Spermatogenesis, Oogenesis, fertilization and implantation. Spermatogenesis, the origin and development of the sperm cells within the male reproductive organs, the testes. The testes are composed of numerous thin, tightly coiled tubules known as the seminiferous tubules; the sperm cells are produced within the walls of the tubules. Within the walls of the tubules, also,are many randomly scattered cells, called sertoli cells, that function to support and nourish the immature sperm cells by giving

has a specific genetic or environmentally induced defect that causes infertility and that varicoceles interact with these defects to exacerbate the already reduced fertility potential. Cadmium exposure and its accumulation are known to impair spermatogenesis, sperm function and lead to impaired reproductive potential in men( Goodwin et

gametogenesis resulting in the formation of spermatocytogenesis, a diploid spermatogonium residing in the basal compartment of seminiferous tubules that are divided mitotically to create two diploid intermediate cells known as primary spermatocytes. Spermatogenesis are very dependent on optimal conditions for the process to correctly happen and vital for sexual reproduction. It begins at puberty as the sperm count increases with age. However, each main spermatocyte moves into the adluminal compartment of

different factors such as infections, smoking, alcohol, pesticides, and different environmental and nutritional factors reversibly or irreversibly influence the male fertility. Key words: Male infertility, Reactive oxygen species, Varicocele, spermatogenesis, Genetic factor, antioxidant, Infertility According to WHO, “Infertility is the inability of a sexually active, non-contracepting

been shown to increase the risk of suboptimal sperm production. There are numerous pesticides which have not been studied in relation to male fertility and further research regarding these is necessary. Testicular trauma can negatively affect spermatogenesis, however scientists do not yet fully understand

Introduction Sexual reproduction in animals requires the generation of haploid gametes from diploid germ cells by the specialized cell division cycle of meiosis. The ploidy is halved because one round of pre-meiotic DNA replication is followed by two rounds of chromosome segregation during meiosis. Homologous chromosomes and sister chromatids segregate during the first and second rounds of meiotic nuclear divisions, respectively. Orderly segregation of homologous chromosomes requires that homologous

1. Explain why evolution often selects traits that promote genetic diversity. Evolution often selects traits that promote genetic diversity because genetic diversity boosts the chances that at least some members of the population will have a combination of traits that will allow them to survive and reproduce in a changing environment. Organisms that rely on asexual reproduction have virtually identical offspring, and they are successful in a stable environment; however, conditions rarely remain

ovulated secondary oocyte. However, before the fertilization process, the gametocytes must go through the stage of maturity. So, how do sperms and oocytes mature? At first, let's talk about the maturation of sperms which is called "spermatogenesis". Spermatogenesis begins during puberty and continues throughout life. It starts by stem cells called "spermatogonia" that go through rapid mitotic division which is a special type of division that occurs only in gonads. After division, the cell will be

causes semen volume to decrease, and it can impair erection and ejaculation, leading to sterility (Marieb & Hoehn, 2013, p.1034). 2. Is there anything that they could try to do to stimulate spermatogenesis? Why is the absence of facial hair important? One thing the doctors could do to try and stimulate spermatogenesis is to give Eric follicle stimulating hormone (FSH) and luteinizing hormone (LH). The LH will promote testosterone production while the FSH will stimulate sperm production (Marieb & Hoehn

Emily Martin’s “The Egg and the Sperm” (1991) highlights the use of “gender stereotypes” often used in the scientific discussion. Martin, an anthropologist at New York University, has extensive knowledge regarding the cultural relations amongst humans and how they view one another. She specifically discusses how “female biological processes” are represented and seen as less worthy than the male processes, and the similar correlation between men and women (486). Martin discusses how different research

The role of religion in the public sphere has been a controversial issue in many Western liberal democracies since religious minorities have raised several issues in order to request for the accommodation of their religious practices. People who support secularism and those who are devoutly religious have two opposing positions in such disputes. In dealing with most of the challenges that have arisen from secularism, the Canadian government provides multiculturalism as the solution. However, is multiculturalism

The nervous system is the most sufferer organ being principal target of number of metals. The alkyl derivatives of certain metals such as lead, mercury and tin are specially neuro-toxic.22 The symptoms associated with acute lead exposure often involves rapid onset of nausea, headaches, cognitive changes, and emotional disruptions. In chronic exposure, fatigue, decreased processing speed, fine and gross motor deficits, and generally decreased cognitive functioning, neuro-degeneration and psychiatric

Clomiphene citrate, more commonly known by its brand names Clomid and Serophene, is a drug prescribed to stimulate ovulation in order to treat infertility. This drug was created by Frank Palopoli in 1956 while he worked for Merrell Company. It was first successfully induced ovulation in women in 1961 and was approved by the Food and Drug Administration (FDA) in 1967(102) It was approved for marketing in 1967 under the brand name Clomid. It was first used to treat cases of oligomenorrhea but was expanded

Physiological Mechanisms of The Veiled Chameleon and The Bluegill Fish Animal Physiology (BIOL 310-01) Dr. Gregg Ward March 17, 2016 Collaborators: Brittney M. Johnson: The Veiled Chameleon Marcia Taylor: Bluegill Fish Organism: The Veiled Chameleon (Reptile) Organism: Bluegill (Fish) Kingdom: Animalia Kingdom: Animalia Phylum: Chordata Phylum: Chordata Class: Reptilia Class: Actinopterygii Order: Squamata Order: Perciformes Family: Chamaeleonidae

PHYSIOLOGICAL FUNCTION OF PROLACTIN Prolactin provides the body with sexual gratification after sexual acts. The hormone counteracts the effect of dopamine, which is linked to sexual arousal. This is thought to cause the sexual refractory period. The amount of prolactin can be an indicator for the amount of sexual satisfaction and relaxation. Elevated levels of prolactin decrease the levels of sex hormones estrogen in women and testosterone in men.Prolactin within the normal reference

higher levels of progesterone compared to men. A Progesterone Blood Test calculates the amount of progesterone levels in the bloodstream. While in case of men, the role of Progesterone hormone is to create or generate sperms also called as spermatogenesis. In women, if the body has good

The rights of animals and their use in biomedical research have been controversial topics with huge societal implications over an extensive period of time (Gannon, 2007). Many animal rights activists claim that all research involving animals should be abolished (Gannon, 2007). On the other hand, countless scientists insist that some experiments require the use of animals and any eliminating or regulating animal testing would impede on their research (Gannon, 2007). Furthermore, It has been estimated

not to be carcinogenic and was readmitted into the market. Cyclamate is converted to a metabolite, cyclohexylamine, which is known to be toxic. Experiments conducted on rates and dogs and rates demonstrated that cyclohexylamine caused damage to spermatogenesis and testicular atrophy (Weihrauch and Diehl, 2004). Aspartame Aspartame, discovered in 1965, entered the market in 1981, is 200 times sweeter than regular sugar and is unique among artificial sweeteners because our bodies are capable of completely

Gynaecology Female Circumcision Female circumcision is a form of female genital mutilation (FGM) that is practiced in certain cultures and religions of Africa, Middle-east and Asia. These patients can present as girls or as adults. Female genital mutilation is a procedure that intentionally cause injury or alter the female genital organs for non-medical reasons and it has no medical benefits for girls or women. Female circumcision or female genital mutilation is not without short and long term complications