Which of the following statements regarding heart valves is NOT true?
a. They are flaplike structures.
b. There are four valves in the heart.
c. They prevent backflow of blood.
d. They must remain tightly closed in order to work properly.
d
Explanation:
a. They are flaplike structures: a true statement
b. There are four valves in the heart: a true statement
c. They prevent backflow of blood: a true statement
d. They must remain tightly closed in order to work properly: correct
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