NEET PG DENTAL EXAM

Detailed explanation-1: -Even though humans have evolved to have relatively little body hair, we still produce goosebumps when cold. Goosebumps occur when tiny muscles in our skin’s hair follicles, called arrector pili muscles, pull hair upright.

Detailed explanation-2: -Arrector pili muscles are enwrapped by sympathetic pilomotor nerves, which release the neurotransmitter norepinephrine (NE) to trigger muscle contraction and cause hairs to become erect in response to cold.

Detailed explanation-3: -The arrector pili muscle is a tiny muscle connected to each hair follicle and the skin. When it contracts it causes the hair to stand erect, and a “goosebump” forms on the skin.

Detailed explanation-4: -Goosebumps occur when the arrector pili muscles cause the hairs to stand up, making the skin look bumpy. When the hairs stand up on the skin, it is known as piloerection. The arrector pili are smooth, involuntary muscles that a person cannot voluntarily contract.