Biology 2e
Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 40, Problem 12RQ

During the systolic phase of the cardiac cycle, the heart is.

  1. contracting
  2. relaxing
  3. contracting and relaxing
  4. filling with blood

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