Campbell Biology (12th Edition)

Published by Pearson
ISBN 10: 0135188741
ISBN 13: 978-0-13518-874-3

Chapter 11 - Test Your Understanding - Levels 5-6 - Evaluating/Creating - Page 233: 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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