Vesicles Prostate Gland Urethra Urinary Bladder Vas Deferens Epididymis Scrotum Testes Penis The bladder collects urine from the kidneys, and the urethra drains urine from the The urethra is a tube inside the The two testes make male sex cells called Sperm develop in very long tubes in each testis cells. These cells The Scrotum holds the testes outside the body. The testes are outside the body because sperm cells develop best at Slightly lower than normal body temperature. The body in cold weather but lets the testes down lower in warm weather. pulls the testes close to the For each testis a long tube called a Sperm duct leads to the urethra. The sperm ducts join the urethra. The function of the Vas detereng whitish liquid, which provides nutrients for the sperm cells. Sperm ducts S is to help make semen, a [10] 4

Caitlyn had unprotected sex with her fiancé about 2 weeksafter her last period, and is worried that she might have becomepregnant. She asks her physician if there are times during hermonthly menstrual cycle when she might be more likely tobecome pregnant. She also asks how birth control pills preventa woman from becoming pregnant. What will the physician tellCaitlyn?

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GnRH can be used to treat some females who want to have childrenbut have not been able to get pregnant. Explain why it is critical toadminister the correct concentration of GnRH at the right time duringthe menstrual cycle.

All germ cells beginning with the ______are genetically different from the rest of thebody cells and therefore must be protectedby the blood–testis barrier.

What is the hormonesecreted by the growingovarian follicles? What is theaction of that hormone uponthe uterus?

Efferent ductule Body of epididymis Ductus deferens Rete testis Straight tubuler Spermatic cord Into inguinal canal www Tail of epididymis Cremaster muscle Tunica vaginalis Head of epididymis Seminal vesicle lobules Septa (tunica albuginea) Tunica albuginea

Under the influence of androgens, theembryonic ______ duct develops into themale reproductive tract.

After passing theepididymides through whichstructures do sperm cells gountil exteriorization?

Although the male ejaculate contains hundreds ofmillions of sperm, ________.a. most do not reach the oocyteb. most are destroyed by the alkaline environmentof the uterusc. it takes millions to penetrate the outer layers ofthe oocyted. most are destroyed by capacitation