Male Reproductive System

Male Reproductive Systems: For Discussion: True or False?

2. Sperm cells are considered by a man’s immune system as “non-self” and are attacked by a man’s own white blood cells.

1. Sperm cells in the female reproductive tract are considered by a woman’s immune system to be “non-self” and are attacked by her white blood cells.

3. A woman, in her reproductive lifetime, has the potential to produce about 500,000 eggs, but she will only ever use about 500.

True

True

True

4. The average man, in a single average ejaculation of semen, emits more reproductive cells than the average woman produces in her

reproductive lifetime. True, about 420 million per average ejaculate, he produces about 4 million/hour

5. Only one sperm may fertilize an egg in humans.

True

True

6. Only about 1 in 42,000 sperm, or 0.00238 % of the sperm in an average ejaculation reach the egg.

MALE REPRODUCTUVE CELL

• SPERM

The Male Reproductive System

Urinarybladder

Vasdeferens

Urethra

Seminal vesicle

Ejaculatory duct

Prostate gland

Cowper’sgland

EpididymusTestes

Scrotum

Penis

Testicles• Produce Sperm– Millions released during

ejaculation– Life span is less then 72

hours

• Produce Testosterone (Male Hormone)– Creates secondary sex

characteristics• Hair• Lower voice• Larger muscles

• Must maintain a certain temperature

- Maintains temperature

Scrotum

Epididymis

- Stores sperm until matured and needed for ejaculation

Vas Deferens-Pathway of sperm and semen during ejaculation

•Penis–Male sex organ–Delivers semen out of the body–urination

•Erection–Sexual arousal–Increased blood flow to tissue–Elongates and makes more rigid

Figure 28.11

The Penis

Figure 28.3

The Male Reproductive System in Anterior View

• Found in the penis

• Tube that carries urine from bladder

• Tube used in ejaculation

Urethra

Accessory glands

• Cowpers Gland– secrete a lubricating fluid• (pre-cum)

• Prostate Gland• Seminal Vesicle

-Secrete a sugary fluid (fructose) that provides energy to the sperm Seminal

Vesicle

Prostate Gland

-Secrete a chemical fluid that helps sperm live longer

The Male Reproductive System

Figure 28.1

Quiz1. Where is sperm stored until needed

for ejaculation?2. What controls the temperature of

testicles?3. What is the name of the male sex

cell?4. What part of the male reproductive

system release testosterone?5. Name one gland that adds fluid to

sperm to make semen.

Quiz- Answers1. Where is sperm stored until needed for

ejaculation? Epididymis2. What controls the temperature of

testicles?Scrotum

3. What is the name of the male sex cell? Sperm

4. What part of the male reproductive system release testosterone? Testes

5. Name one gland that adds fluid to sperm to make semen. Prostate, or Cowper’s or Seminal Vesicles

• Virtual diagram of the male reproductive system