Near the end of the first trimester, deoxygenated blood flows from the developing embryo or fetus to the placenta through
A) paired umbilical veins.
B) the superior vena cava.
C) one umbilical vein.
D) three umbilical arteries.
E) paired umbilical arteries.

Question

Quizplus · Accepted Answer

Near the end of the first trimester, deoxygenated blood flows from the developing embryo or fetus to the placenta through the paired umbilical arteries. There are two umbilical arteries that carry deoxygenated blood and waste products from the fetus to the placenta, where these substances are exchanged for oxygen and nutrients from the mother's blood.

Near the End of the First Trimester, Deoxygenated Blood Flows