Crystal had both her left ovary and her right uterine tube removed surgically at age 17 because of a cyst and a tumor in these organs. Now, at age 32, she remains healthy and is expecting her second child. How could Crystal conceive a child with just one ovary and one uterine tube, separated on opposite sides of the pelvis?

Fill in the blanks: The ________ is the site of fertilization in the female reproductive system, and the ________ is the site of implantation of the fertilized ovum.

The uterine wall and the vaginal wall share some superficial similarities. For example, in both structures, the middle layer is composed of:

Fill in the blanks: Within the lobes of the mammary glands are smaller units called ________ , which contain glandular ________ that produce milk when a woman is lactating.

Mammary glands are actually modified ___________.