★ Heart Structure and Double Circulation Quiz
When the ventricles contract, the bicuspid (mitral) valve prevents blood from flowing from the ________.
A. right ventricle to right atrium
B. left ventricle to left atrium
C. left atrium to the right atrium
D. right atrium to the left atrium
Select your answer:
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What is the incubation period for the Corona-virus?
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B. 7-10 days
C. up to 14 days
D. 24 hours