Male Male Reproductive Reproductive

SystemSystem

1. At puberty, hormones released by the 1. At puberty, hormones released by the pituitary gland stimulate the testes.pituitary gland stimulate the testes.

2. Testes release hormone testosterone 2. Testes release hormone testosterone that causes physical changes associated that causes physical changes associated with male sexual maturity:with male sexual maturity: Broadening of the shoulders.Broadening of the shoulders. Development of skeletal muscles.Development of skeletal muscles. Facial and other body hair.Facial and other body hair. Depending of the voice.Depending of the voice.

FunctionsFunctions

1. Produce male sex cells called 1. Produce male sex cells called sperm.sperm.

2. Provide a way to transfer sperm to 2. Provide a way to transfer sperm to female’s body during intercourse.female’s body during intercourse.

StructureStructure

Scrotum is a sac that contains the testes..Scrotum is a sac that contains the testes.. Protects sperm by regulating temperature:Protects sperm by regulating temperature:

When cold muscles will contract moving testes When cold muscles will contract moving testes closer to the body.closer to the body.

When warm muscles will relax, lowering the testes When warm muscles will relax, lowering the testes away from the body.away from the body.

Testicles (testes) are two glands that Testicles (testes) are two glands that contain coiled tubules where male contain coiled tubules where male reproductive cells are produced.reproductive cells are produced. 100 million/day, look like tadpoles.100 million/day, look like tadpoles.

3. Epididymis is a large coiled tube 3. Epididymis is a large coiled tube on surface of testes where sperm on surface of testes where sperm mature.mature.

4. Vas deferens 4. Vas deferens A. Tubes about 18 inches long.A. Tubes about 18 inches long. B. Extend from epididymis on each B. Extend from epididymis on each

testis to the seminal vesicles.testis to the seminal vesicles.

5. Seminal vesicles5. Seminal vesicles A. Paired glands found attached to the A. Paired glands found attached to the

vas deferens at the base of the bladder.vas deferens at the base of the bladder. B. Secrete a fluid that nourishes sperm B. Secrete a fluid that nourishes sperm

and allows mobility.and allows mobility.

6. Ejaculatory duct is formed where 6. Ejaculatory duct is formed where the seminal vesicles and vas the seminal vesicles and vas deferens join.deferens join.

7. The prostate gland is a gland 7. The prostate gland is a gland around the urethra at the base of the around the urethra at the base of the bladder that adds fluid to sperm.bladder that adds fluid to sperm.

8. Cowper’s glands are small, paired 8. Cowper’s glands are small, paired glands below the prostate, add fluid glands below the prostate, add fluid that neutralizes the acid content that neutralizes the acid content before ejaculation.before ejaculation.

9. Semen is now complete: Consists 9. Semen is now complete: Consists of sperm from the testicles and of sperm from the testicles and secretions from three glands: secretions from three glands: seminal vesicles, prostate gland, seminal vesicles, prostate gland, Cowper’s gland.Cowper’s gland. Contains 100-500 million sperm in one Contains 100-500 million sperm in one

teaspoon of fluid.teaspoon of fluid.

10. The urethra extends from the 10. The urethra extends from the bladder through the penis.bladder through the penis. Shared by urinary and reproductive Shared by urinary and reproductive

systems.systems.

11. Penis is attached to the body above 11. Penis is attached to the body above the testes.the testes. A. Covered by foreskin that may be A. Covered by foreskin that may be

removed at birth in procedure called a removed at birth in procedure called a circumcision.circumcision.

B. Composed of spongy tissue with many B. Composed of spongy tissue with many blood vessels.blood vessels.

C. Stimulation or sexual arousal caused C. Stimulation or sexual arousal caused increased blood flow that results in an increased blood flow that results in an erection.erection.

D. Muscular contractions of vas D. Muscular contractions of vas deferens caused ejaculation of semen deferens caused ejaculation of semen that occurs during male orgasm.that occurs during male orgasm.