Multiple choice

In which of the following phenomena are arrector pili muscles involved?

  1. Keratinisation

  2. Goose bumps formation

  3. Desquamation

  4. Sense of touch

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Arrector pili muscles are smooth muscle cells attached to hair follicles. When they contract, they pull the hair into an upright position, causing skin dimples (goose bumps).