Essentials of Human Anatomy & Physiology (12th Edition)

Published by Pearson
ISBN 10: 1292216239
ISBN 13: 978-1-29221-623-2

Chapter 4 - Skin and Body Membranes - Review Questions - Page 158: 16

Answer

Arrector pili are a small group of smooth muscle cells that connect hair follicles to the dermis. On receiving signals from the autonomic nervous system, these muscles contract, making the hair stand upright, which acts as insulation in cold weather.

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