Procedure 3 Time to Trace! thi eurie you wel ih mi oducin nthe mae and foms at w

Question

Procedure 3 Time to Trace! thi eurie you wel ih mi oducin nthe mae and foms at which eh well s the they mect to form a zypote. This tracing involves the anatoeny of the male and femalk repro to the point as well as the steps of gametogenesis. STEP 1: Male Gamete Trace the male garnete from its earliest star the spermatoponan athe seminiferous t body and enters the uterine tube of the female reproductive tract. Trace the pathway using Higure through the male reproductive tract until it exits the pathway using Figure 27.20, and also fill in the space provided. RGURE 27.20 Male reproductive tract Start: Spermatogonium End: Uterine tube 28 Exploring Anatomy& Physiology in the Laboratory

Explanation / Answer

STEP 1: MALE GAMETE:

Spermatogonium- The germ cells from the seminiferous tubules in the testis undergoes mitotic division to form spermatogonial stem cells.The mitotic division gives rise to two kinds of cell namely type A and type B. The type B cells differentiates into spermatocytes. The primary spermtocyte undergoes meiotic division to form 2 secondary spermatocytes; the latter again divides to form 2 haploid spermatids. They are then converted into mature sperm by the process of spermiogenesis. Maturation of the sperm occurs in the epididymis.

Sperm travels from the ductus deferens and up the spermatic cord into the pelvic cavity, over the ureter to the prostate behind the bladder. Here, the vas deferens joins the seminal vesicle to form the ejaculatory duct, which passes through the prostrate and empties into the urethra. Upon the sperm's exit from the testes, into the vas deferens, muscular movements take over. When ejaculation occurs, rhythmic movements of peristalsis propel the sperm forward.

The sperm use their tails to push themselves into the epididymis where they complete their development.It then moves to vas deferens. The seminal vesicles and prostate gland produce a whitish fluid called seminal fluid, which mixes with sperm to form semen when a man is stimulated. When the male genitala becomes stimulated to orgasm, muscles around the reproductive organs contract and force the semen through the duct system and urethra. It is essentially deposited near the cervix from where the sperm make up their way up through the cervix and move through the uterine tube with help from uterine contractions.

STEP 2: FEMALE GAMETE

Oogonium- They are self renewing stem cells which are present during the lifetime of a female organism. They undergo first meiotic division to form the primary oocytes and progress through the prophase of meiosis and are maintained till puberty. At adolescence, they resume meiosis. At divison of the primary oocyte, the germinal vesicle breaks down followed by the migration of metaphase spindle. The result is that one of the daughter cells contains the entire volume of cytoplasm while the other contains none. This volumnous cell forms the secondary oocyte and the smaller cell forms the polar body. A second meiotic division results in the formation of a mature egg or ovum and a second polar body. The mature egg contains the lining of follicle forming corpus luteum present in uterine tube.

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