Biology
Biology
10th Edition
ISBN: 9780073383071
Author: Raven
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 49, Problem 2U

Systole is vitally important to heart function and begins in the heart with the

a. activation of the AV node.

b. activation of the SA node.

c. opening of the voltage-gated potassium gates.

d. opening of the semilunar valves.

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