Campbell Biology (10th Edition)

Published by Pearson
ISBN 10: 0321775651
ISBN 13: 978-0-32177-565-8

Chapter 11 - Test Your Understanding - Level 3 - Synthesis/Evaluation - Page 231: 10

Answer

By blocking cAMP phosphodiesterase, caffeine prevents the degradation of cAMP, maintaining this important second messenger from the fight-or-flight response.

Work Step by Step

Caffeine thus acts to inhibit the shut-off of signalling, keeping cAMP levels high, as well as the alertness that comes with that.
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