Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 46 - The Musculoskeletal System - Figure 46.18 - Inquiry Question: 1

Answer

The maximum amplitude comes when contraction frequency becomes more frequent, causing contractions to have their amplitudes add together.

Work Step by Step

To see this, look at Fig. 46.18 and the text on p. 975. The summated contraction in Fig. 46.18 has a peak and then another peak, with multiple ones like this in the tetantic contraction in that figure. The text makes it clear that this comes from contractions adding on top of one another like waves in the ocean adding together to make one large rogue wave.
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