Human Fertilization and Embryogenesis

Human Fertilization and Embryogenesis

Fertilization

b) Sperm Entry

Where does fertilization occur in humans?

Fertilization usually occurs in the fallopian tube, not in the uterus.

How many sperms are needed for fertilization?

Only one sperm fertilizes the egg, although millions may enter the female body.

When does the heart of the embryo start beating?

Around the fourth week of development.