Calcium assists in the contraction of a muscle. In which area of the heart is the impulse to contract stimulated?
A) Sinoatrial node
B) Atrioventricular node
C) Tricuspid valve
D) Mitral valve
Ans: A
Impulses that stimulate contraction normally originate in specialized cells (sinoatrial node) near the top of the right atrium.
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