The Reproductive System - The Female Reproductive System - Conception and Pregnancy

Question 1

Pregnancy starts when a sperm cell reaches the egg and penetrates the ____ or outside layer of the ____ and enters it

Answer 1

epithelial

egg

Question 2

When the sperm makes it to the center and combines its nucleus with the egg’s nucleus, a fertilized egg cell called a ____ is created

Answer 2

zygote

Question 3

As soon as the zygote divides itself into two cells, it’s called an ____

Answer 3

embryo

Question 4

Cell division continues at a rapid pace; by the time the embryo implants itself on the uterine wall a few days later, it’s a cluster of ____ cells

Answer 4

16

Question 5

Four weeks later, it has a ____ and ____. After the second month, the embryo is referred to as a ____

Answer 5

brain and spinal cord

fetus