★ Circulatory / Respiratory 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
Preview next quiz:
Mammals have a _____________ chambered heart. The top two chambers are called ________________.
A. 3; atria
B. 4; atria
C. 4; ventricles
D. 3; ventricles
E. none of these
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