When the papillary muscles contract, the ______________ tighten, preventing blood from regurgitating from the ventricles to the atria.
A. semilunar valves
B. chordae tendineae
C. coronary sinuses
D. tricuspid valves
Answer: B. chordae tendineae
Health Professions
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A. Mollusca B. Scorpions C. Anemones D. Sea wasps
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Choanal polyp is reported with code _____.
Fill in the blank(s) with the appropriate word(s).
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