The fetal shortcut from the right atrium to the left atrium is the
A. ductus arteriosus.
B. foramen ovale.
C. umbilical artery.
D. ductus venosus.
E. umbilical vein.
Answer: B
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Which water-soluble vitamin cannot be absorbed by the intestinal mucosa unless it has been bound to intrinsic factor?
A) vitamin B12 B) vitamin C C) vitamin B6 D) vitamin D E) vitamin K
An increase in plasma levels of ________ causes a yellowish appearance of the skin and the whites of the eyes. This condition is called ________.
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The aponeurosis of the external oblique forms the ________ at its inferior margin.
A. rectus sheath B. linea semilunaris C. medial retinaculum D. linea alba E. inguinal ligament
The ischemic phase of the uterine cycle is brought on by vascular spasms, which in turn are a response to what?
A. Ovulation B. Menstruation C. Rising LH level D. Falling progesterone level E. Rising progesterone level