Human Biology, 14 Edition

Published by McGraw-Hill Education
ISBN 10: 1-25924-574-8
ISBN 13: 978-1-25924-574-9

Chapter 5 - Engage - Page 113: 1

Answer

5. 1 The brain receives fear impulses and processes them; it then sends messages to heart muscles to increase the force of contraction.. This will appear on an EKG.

Work Step by Step

b. Fear also causes stress hormones (catecholamines--epinephrine and non-epinephrine) to be released from the adrenal medulla. The effect is additive; force of contraction and heart rate (HR) will increase.
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