involuntary
The Arrector Pili muscle
The arrector pili and epidermis are related only in that the action of the arrector pili causes "goosebumps" to form at the epidermis.
arrector pili.
Arrector pili is the muscle the raises hair. This is taught in health class.
Arrector pili muscle- Minute, involuntary muscle in the base of the hair follicle that causes "goose bumps".Hope this helps you
arrector pili
arrector pili
Within the hair follicles.
hair follicles
arrector pili
Arrector Pili Muscle
''goose bumps'' are formed