Answer
Strengthening of the heart muscle.
Work Step by Step
A stronger heart muscle increases stroke volume, which allows the same amount of blood to be moved in fewer contractions.
Campbell Biology (11th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Published by
Pearson
ISBN 10:
0-13409-341-0
ISBN 13:
978-0-13409-341-3
Chapter 42 - 42.2 - Concept Check - Page 927: 3
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