1. Aim: How is the Human Reproductive System built to do its job?

2. What is the job of the Female reproductive system?
Produce eggs
Produce hormones to control the secondary sex characteristics
Pregnancy
Birth
Nourish newborn

3. Female Reproductive System
3. Uterus (D)
Embryo implants and develops
4. Vagina
Birth canal
Where sperm is deposited

4. Female Reproductive System
Ovaries (B)
produce egg cells (meiosis)
release the hormones estrogen and progesterone
2. Fallopian Tube/Oviduct (A)
Site of fertilization
Carries egg to uterus

5. What is the job of the Male Reproductive System?
Produce sperm
Produce hormones to control the Secondary sex characteristics
Fertilize the female internally
(release urine)

6. Male Reproductive system
Testes
produce sperm
Production of the hormone testosterone
2. Scrotum
sac that keeps testes cool
3. Vas Deferens
Carries sperm from the testes to the urethra

7. Male Reproductive system
4. Prostate Gland (and Seminal Vesicles and Cowpers Glands)
Produce the fluid of the semen:
Liquid for sperm to swim (Internal Fertilization on land
Base- neutralize acid in female body
Sugar – for energy to swim
5. Urethra
Tube which runs through the penis to release:
Urine
semen

8. INTERNAL FERTILIZATION
Eggs and sperm meet inside the female’s body
Live on Land (no water for sperm to swim to egg in the environment
Ex. birds, mammals

9. EXTERNAL FERTILIZATION\
Eggs fertilized outside female’s body
mostly in aquatic environments
Ex. Fish, starfish

10. Which is better? Internal: Less eggs produced because:
most meet sperm and fertilization increases
Less are eaten
Constant environment inside body

11. Embryonic Development
The zygote grows into an entire body. Development can be either INTERNAL or EXTERNAL, depending on the organism.

12. INTERNAL DEVELOPMENT
Embryo develops inside the female, placenta provides nourishment

13. Human Fertilization
Internal fertilization – male penis is used to introduce sperm into female’s vagina.

14. Where does fertilization usually occur?
Fertilization occurs in the fallopian tubes (oviduct)
Ovary
Fertilization
Egg

15. How many eggs are released a month by a female?
Normally one however, sometimes TWO can be released at the same time.
Ovulation
This is called ovulation!

16. What happens after fertilization?
The embryo travels to the uterus and implants itself in the uterus lining

17. Nova – The Miracle of life
NOVA Online | Life's Greatest Miracle | Watch the Program Here