Arrector pili

Definition

The arrector pili are small muscles located at the base of hair follicles in the skin. These muscles contract in response to cold or fear, making the hair stand on end and creating what is commonly known as "goosebumps."

Related terms

Hair Follicle:

A dynamic skin organ that produces hair through a complex cycle of growth, rest, and renewal.

Sebaceous Glands:

Glands associated with hair follicles that secrete sebum, an oily substance that helps to lubricate and waterproof the skin and hair.

Thermoregulation:

The process by which animals maintain their internal body temperature within a tolerable range despite external temperature changes