Answer
The time difference allows blood to flow from the atria to the ventricles.
Work Step by Step
The movement of blood is not instantaneous. The delay between these electrical impulses allow the ventricles to actually fill before contracting.
Campbell Biology (12th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Published by
Pearson
ISBN 10:
0135188741
ISBN 13:
978-0-13518-874-3
Chapter 42 - 42.2 - Concept Check - Page 929: 2
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