1. Name the four valves of the heart. 2. Contraction of the heart is known as ________, and relaxation is known as ___________. 3. Name the three layers surrounding the lumen of veins and arteries.


1. Name the four valves of the heart.


2. Contraction of the heart is known as ________, and relaxation is known as ___________.


3. Name the three layers surrounding the lumen of veins and arteries.



May 25, 2022
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