Namo’s Answers to Arlindo’s Worksheet. Outline the processes involved in semen production from the start of sperm formation spermatogenesis to ejaculation. Spermatogenesis is highly dependent upon optimal conditions for the process to occur correctly, and is essential for sexual reproduction. The primary spermatocyte is arrested after DNA synthesis and prior to division. Award 1 for each of the following structures clearly drawn and correctly labeled. Draw the structure of the human female reproductive system immediately before ovulation. Hargreave 26 August

In mammals it occurs in the seminiferous tubules of the male testes in a stepwise fashion. Outline the regulation of pregnancy by two named hormones. New England Journal of Medicine. It consists of three phases: The mature spermatozoa are released from the protective Sertoli cells into the lumen of the seminiferous tubule in a process called spermiation. Draw the structure of a mature human egg. All articles with unsourced statements Articles with unsourced statements from September All articles with dead external links Articles with dead external links from December Articles with permanently dead external links.

About Contact Us Privacy Policy. Anonymous 2 May at A single Sertoli cell extends from the basement membrane spermatogensis the lumen of the seminiferous tubule, although the cytoplasmic processes are difficult to distinguish at the light microscopic level.


Diploid cells in the ovary undergo meiosis to form a primary follicle consisting of haploid cells. The LH surge induces this stage and meiosis I is now complete. Type A cells replenish the stem cells, and type B cells differentiate into spermatocytes.


Recent Prog Horm Res. Cell Cycle and Division. While in the epididymis the spermatozoa gain motility and become spermatogenesiz of fertilization. Outline the way in which a pregnancy can be detected at a very early stage. Anonymous 16 September at By visiting this site you agree to the foregoing terms and conditions.

The seminiferous tubules of the testes are the starting point for the process, where spermatogonial stem cells adjacent to the inner tubule wall divide in a centripetal direction—beginning at the walls and proceeding into the innermost part, or lumen —to produce immature sperm. Just Walk On By: In this article we shall look at both spermatogenesis and oogenesis. Cells and their Components. Spermatogenesis produces mature male gametes, commonly called sperm but more specifically known okgenesis spermatozoawhich are able to fertilize the counterpart female gamete, the oocyteduring conception to produce a single-celled individual known as a zygote.

The hormone inhibin acts to decrease the levels of FSH. Outline the role of positive feedback in the process of birth in humans. Explain the function and structure of the placenta.


spermatogenesis and oogenesis essay

The Golgi apparatus surrounds the now condensed nucleus, becoming the acrosome. This replenishment of spermatogonia means that males are fertile throughout their adult life.

spermatogenesis and oogenesis essay

Grade 11 Geography Book. It should also be noted that not all spermatogonia divide to produce spermatocytes; otherwise, spermatogfnesis supply of spermatogonia would run out.


Life sciences Grade12 School. Connections between organs must be correct for full marks. Testes produce to million spermatozoa daily. Outline the levels of each of oogeness hormones that control the menstrual cycle immediately before ovulation.

State the role of the amniotic sac and the amniotic fluid. The process of formation of sperms is called Spermatogenesis.

Spermatogenesis – Wikipedia

Unknown 1 August at The Journal of Experimental Biology. The Encyclopaedia of Sports Medicine: In other projects Wikimedia Commons. Spermatid DNA also undergoes packaging, becoming highly condensed. Good Luck, we dssay currently busy thus I cannot answer your questions but I hope those guides will.