The most important aspect of the end of the germinal period in pregnancy is that:
a. the human cells have begun to differentiate and assume specialized roles.
b. the self-sustaining placenta has formed, obtaining nutrients and eliminating waste products.
c. the vascular system is established and begins to force blood to circulate.
d. the neural tube, precursor to the heart and spinal cord, forms.
Question 2
The first phase of pregnancy is known as the _________ and it typically lasts about __________.
a. gestation stage; two weeks
b. embryonic stage; eight weeks
c. germinal stage; two weeks
d. germinal stage; six weeks
Sections of the Human Brain
human anatomy
Embryonic Period
Life support system of a developing human
The human brain
Neanderthal and Modern Human