Which structure is a bundle of smooth muscle fibers that are attached to the hair follicle?
A) cuticle
B) root
C) medulla
D) arrector pili

Question

​Which structure is a bundle of smooth muscle fibers that are attached to the hair follicle?
A) ​cuticle
B) ​root
C) ​medulla
D) ​arrector pili

Quizplus · Accepted Answer

The arrector pili is a bundle of smooth muscle fibers that are attached to the hair follicle. When this muscle contracts, it causes the hair to stand on end or "goosebumps" to occur. The cuticle is the outermost layer of the hair shaft, the root is the part of the hair that is embedded in the skin, and the medulla is the innermost layer of the hair shaft.

​Which Structure Is a Bundle of Smooth Muscle Fibers That

Which Structure Is a Bundle of Smooth Muscle Fibers That