Life: The Science of Biology 11th Edition

Published by W. H. Freeman
ISBN 10: 1-31901-016-4
ISBN 13: 978-1-31901-016-4

Chapter 49 - Circulatory Systems - 49.5 - The Circulation Is Controlled by Hormonal and Neural Signals - 49.5 Recap - Learning Outcomes - Page 1065: 1

Answer

Smooth muscle precapillary sphincters on adjacent arterioles can close off a capillary bed to blood flow. Autoregulation is dependent on how the smooth muscle reacts to its chemical environment. The smooth muscle relaxes when there are low oxygen and high carbon dioxide levels and contracts when there is sufficient oxygen in the area.

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