★ Circulatory / Respiratory Quiz
What causes the semilunar valves to open?
A. contraction of the ventricles
B. contraction of the atria
C. stimulation of the SA node
D. backflow of blood in the aorta and pulmonary artery during diastole
E. contraction of the cardiac muscle that makes up the valves
Preview next quiz:
Which of the following initiate the blood clotting process?
A. red blood cells
B. plasma
C. white blood cells
D. platelets
E. all of these
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