Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Each hair root is connected to a smooth muscle called the arrector pili that contracts in response to nerve signals from the sympathetic nervous system, making the external hair shaft “stand up.”

From Textbooks • Jun. 19, 2013

In addition to these specialized receptors, there are sensory nerves connected to each hair follicle, pain and temperature receptors scattered throughout the skin, and motor nerves innervate the arrector pili muscles and glands.

From Textbooks • Jun. 19, 2013

In addition, arrector pili muscles can contract causing individual hairs to stand up when the individual is cold.

From Textbooks • Apr. 25, 2013