Male Reproductive System

1. At puberty, hormones released by the pituitary gland stimulate the testes. 1. At puberty, hormones released by the pituitary gland stimulate the testes. 2. Testes release hormone testosterone that causes physical changes associated with male sexual maturity: 2. Testes release hormone testosterone that causes physical changes associated 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.

Functions 1. Produce male sex cells called sperm. 1. Produce male sex cells called sperm. 2. Provide a way to transfer sperm to female’s body during intercourse. 2. Provide a way to transfer sperm to female’s body during intercourse.

Structure 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 closer to the body. When cold muscles will contract moving testes closer to the body. When warm muscles will relax, lowering the testes away from the body. When warm muscles will relax, lowering the testes away from the body. Testicles (testes) are two glands that contain coiled tubules where male reproductive cells are produced. Testicles (testes) are two glands that contain coiled tubules where male reproductive cells are produced. 100 million/day, look like tadpoles. 100 million/day, look like tadpoles.

3. Epididymis is a large coiled tube on surface of testes where sperm mature. 3. Epididymis is a large coiled tube on surface of testes where sperm 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 testis to the seminal vesicles. B. Extend from epididymis on each testis to the seminal vesicles.

5. Seminal vesicles 5. Seminal vesicles A. Paired glands found attached to the vas deferens at the base of the bladder. A. Paired glands found attached to the vas deferens at the base of the bladder. B. Secrete a fluid that nourishes sperm and allows mobility. B. Secrete a fluid that nourishes sperm and allows mobility. 6. Ejaculatory duct is formed where the seminal vesicles and vas deferens join. 6. Ejaculatory duct is formed where the seminal vesicles and vas deferens join.

7. The prostate gland is a gland around the urethra at the base of the bladder that adds fluid to sperm. 7. The prostate gland is a gland around the urethra at the base of the bladder that adds fluid to sperm. 8. Cowper’s glands are small, paired glands below the prostate, add fluid that neutralizes the acid content before ejaculation. 8. Cowper’s glands are small, paired glands below the prostate, add fluid that neutralizes the acid content before ejaculation.

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

10. The urethra extends from the bladder through the penis. 10. The urethra extends from the bladder through the penis. Shared by urinary and reproductive systems. Shared by urinary and reproductive systems. 11. Penis is attached to the body above the testes. 11. Penis is attached to the body above the testes. A. Covered by foreskin that may be removed at birth in procedure called a circumcision. A. Covered by foreskin that may be removed at birth in procedure called a circumcision. B. Composed of spongy tissue with many blood vessels. B. Composed of spongy tissue with many blood vessels.

C. Stimulation or sexual arousal caused increased blood flow that results in an erection. C. Stimulation or sexual arousal caused increased blood flow that results in an erection. D. Muscular contractions of vas deferens caused ejaculation of semen that occurs during male orgasm. D. Muscular contractions of vas deferens caused ejaculation of semen that occurs during male orgasm.