Online College Courses for Credit




This lesson will explain the process involved in the implantation of a zygote in the uterus.

See More
Fast, Free College Credit

Developing Effective Teams

Let's Ride
*No strings attached. This college course is 100% free and is worth 1 semester credit.

29 Sophia partners guarantee credit transfer.

311 Institutions have accepted or given pre-approval for credit transfer.

* The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 27 of Sophia’s online courses. Many different colleges and universities consider ACE CREDIT recommendations in determining the applicability to their course and degree programs.

Terms to Know
Ectopic Pregnancy

Also called tubal pregnancy, an ectopic pregnancy occurs when implantation occurs in the oviduct instead of the uterus. Ectopic pregnancies result in abdominal pain that will eventually cause the oviduct to rupture if the pregnancy isn’t terminated.


The inner layer of tissue within the uterus; the deepest tissue layer of the uterus where the blastocyst implants itself.

Human Chorionic Gonadotropin (HCG)

A hormone secreted from the developing placenta(blastocyst) that prevents the destruction of the corpus luteum; the corpus luteum secretes estrogen and progesterone which prepares the female’s body for pregnancy.


A term used to describe when the blastocyst attaches to the endometrium of the uterus.