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The valve at the base of the aorta preventing backflow has flaps numbering:

A3
B2
C4
D5
Answer & Solution
Correct answer: A. 3
1. The aortic valve is a semilunar valve. 2. Its cusps close as the ventricle relaxes. 3. It normally has 3 flaps. _Source: OpenStax Anatomy and Physiology 2e, Chapter 19, The Cardiovascular System: The Heart._
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