The chorionic villi
A) help prepare the mammary glands for milk production.
B) are free endodermal tips that grow toward the wall of the blastocyst.
C) bulge into the amniotic cavity at the head fold and extend toward the trophoblast.
D) provide the surface area for gaseous exchange between fetal and maternal bloodstreams.
E) form constrictions that narrow the yolk stalk and the body stalk between the embryo and the surrounding trophoblast.
D) provide the surface area for gaseous exchange between fetal and maternal bloodstreams.
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The partial pressure of carbon dioxide is greatest in
A) venous blood. B) alveolar air. C) expired air. D) inspired air. E) arterial blood.
If a woman gives birth to identical triplets, how many ova were fertilized?
A) one B) two C) three D) from one to three E) one or two
Lymph contains protein
Indicate whether this statement is true or false.
During skin development, cuboidal cells of the periderm flatten to form the ectoderm.
Answer the following statement true (T) or false (F)