The heart begins to beat at:

The stalks of the yolk sac and allantois establish the outer portion of what structure?

In the placenta…

True or False: Non-Hispanic white women are more likely to suffer from coronary heart disease (CHD) compared to black women.

A condition in which the upper portion of the stomach protrudes into the chest cavity is called a ____________.

Gastrulation is the process when cells of the embryo:

The mesodermal germ layers develop into:

The ball of constantly dividing cells during the first week of development is called the:

The mature placenta is composed of tissues derived from:

Pharyngeal arches form after neural tube closure. Arch one will become the ___________.