Ch 18 NOTES Reproduction . Section 18.2 Male Reproductive System. I. Structure and Function : . produce sex hormone , testosterone produce and store the male reproductive cells, sperm deliver sperm to the female reproductive system to join with an egg in the process of fertilization . .
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Testes - two small glands that produce the male sex cells, sperm – 100 million per day starting at puberty.
Undescended testis: when one or both of the testes may not descend into the scrotum before birth.
- Semen are released from the penis during the process of ejaculation.
4. Nocturnal Emission or wet dream – usually occurs when a male begins to produce sperm, occurs normally when the male ejaculates during sleep.
Days 5–13 An egg matures in one of the ovaries, and the uterine lining starts to thicken.
Days 14–15 The ovary releases the mature egg during ovulation.
Days 16–22 The egg travels through the fallopian tube to the uterus, and the uterine lining continues to thicken.
Days 23–28 The unfertilized egg enters the uterus.
The Menstrual Cycle
It can take 7 days for the egg to travel from the fallopian tube to the uterus
Infertility – the inability to become pregnant. This is most often due to a blocked fallopian tube and problems with ovulation