Question

In human females, each time during maturation and release of an egg, the inner wall of the uterus thickens. Is this thickening permanent?

• A. Yes
• B. No
• C. It becomes permanent in few females.
• D. Cannot be decided

Answer 1

The correct option is B No

The endometrium or the innermost lining of the uterus thickens each time an egg is released. The thickening is due to the increase in the number of blood vessels in order to provide a surplus supply of nutrients and oxygen to the embryo if the released egg gets fertilized.

If the egg does not get fertilized, the uterus lining sheds off in the process called menstruation. So, this endometrium thickening is not permanent.
Thus, the correct answer is option B.