Question

which smooth muscle causes goosebumps when it contracts?
papillary muscle
sebaceous gland
arrector pili
flexor muscle

Explanation:

Goosebumps result from the contraction of smooth muscles attached to hair follicles. Papillary muscles are cardiac, sebaceous glands are not muscles, flexor muscles are skeletal. Arrector pili muscles contract to pull hair upright, causing goosebumps.

Answer:

C. Arrector Pili