GENERAL HISTOLOGY

Detailed explanation-1: -Goosebumps occur when tiny muscles in our skin’s hair follicles, called arrector pili muscles, pull hair upright. For animals with thick fur, this response helps keep them warm.

Detailed explanation-2: -Hair Erector Muscle (Arrector Pili Muscle) 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-3: -Arrector pili muscles are tiny muscles attached to follicles of hair in mammals. Contraction of these muscles causes hairs to stand on end also known as goosebumps. Each arrector pili muscle is composed of a bundle of smooth muscle fibers that attach to several follicles.

Detailed explanation-4: -Each arrector pili is composed of a bundle of smooth muscle fibres, which attach to several follicles (a follicular unit) and is innervated by the sympathetic branch of the autonomic nervous system. The contraction of the muscle is, therefore, involuntary .