What causes closure of the foramen ovale at birth?
A. A rise in fetal oxygen levels, which triggers growth of the epithelial lining
B. Rapid myocardial tissue growth stimulated by pregnancy hormones
C. Higher pressure in the left atrium, which causes interatrial septum flaps to close
D. Migration of connective tissue from the right atrioventricular valve
E. An increase in endothelial mucous production, which forms a plug
Answer: C
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To pinch with a thumb and finger involves a movement called
A) rotation. B) opposition. C) circumduction. D) eversion. E) retraction.
The end result of the classical and alternative pathways of complement activation is
A) an increase in pyrogen release. B) release of histamine. C) activated C3B attached to the cell wall. D) C1 bound to two antibodies. E) activation of properdin.
What is the active ingredient in catnip?
a. nepatalactone b. ginsenoside c. allicin d. fructofuranoside
Testis-determining factor directs a series of events that leads to differentiation of the gonad to the male form
Indicate whether the statement is true or false