McGraw-Hill Online Learning Center Test<BLURT>

McGraw-Hill Online Learning Center Test


1. Review the animation and answer the following questions.

The heart muscle contractions are coordinated by

A. mechanical timing devices throughout the heart.
B. chemical signals.
C. electrical impulses through the conduction system.
D. a single electrical signal since the entire heart contracts at once.


2. In a normal cardiac cycle, the first site to receive an impulse is the A. sinoatrial node.
B. atrioventricular node.
C. atrioventricular bundle.
D. Purkinje fibers.
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