What is/are the stimulus(-i)for contraction of the arrector pili muscles?
A)Low blood pH
B)Dry skin
C)Cold temperature or fear
D)Hot temperature
E)Hot temperature or fear

Question

Quizplus · Accepted Answer

The stimulus for contraction of arrector pili muscles is cold temperature or fear, which leads to the hair standing up or "goosebumps". Dry skin, low blood pH, and hot temperature are not known to directly stimulate the arrector pili muscles. Option E includes hot temperature, which is contradicted by the statement above. Therefore, only option C is the best choice.

What Is/are the Stimulus(-I)for Contraction of the Arrector Pili Muscles