Q. Which muscles in the skin contract to make the hairs on our skin stand up straight (goose bumps) when we are cold or frightened?
Answer:
Arrector pili
Notes: Arrector pili is a microscopic band of muscle tissue which connects a hair follicle to the dermis. ? When stimulated, the arrector pili will contract and cause the hair to become more perpendicular to the skin surface (stand on end), known colloquially as goose bumps.