L3

Question 1

How many sperms are deposited in the vagina during ejaculation?

Answer 1

200-300 million sperms are deposited in the vagina.

Question 2

How many sperms can reach the site of fertilization?

Answer 2

Only 300-500 sperms can reach the site of fertilization (Fallopian or uterine tube).

Question 3

What helps sperms reach the site of fertilization?

Answer 3

• Contraction of the wall of the uterus and uterine tube.
• Chemo-attractants released by cells around the ovum.

Question 4

What happens if fertilization does not occur within 24 hours of ovulation?

Answer 4

• The ovum degenerates.
• Sperms become unable to fertilize after 48 hours of ejaculation.

Question 5

What is the definition of fertilization?
And Where does fertilization occur?

Answer 5

It is the fusion between male and female gametes to form the zygote.
In the ampulla of the uterine (Fallopian) tube.