Question

when these muscles contract (during cold or fright), the slanted hair follicle is pulled upright, dimpling the skin surface with goosebumps. what are these muscles called? a) arrector pili muscle b) follicle muscle c) sebaceous muscle d) hair bulb muscle question 10 (mandatory) (0.5 points) the portion of hair that projects from the scalp surface is known as the: a) bulb b) matrix c) root d) shaft

Explanation:

First Question (Muscle causing goosebumps)

The arrector pili muscle is the smooth muscle attached to hair follicles. When it contracts (due to cold, fear, etc.), it pulls the hair follicle upright, causing the skin to dimple (goosebumps). Other options: Follicle muscle is not the correct term; sebaceous muscle is incorrect (sebaceous glands are for oil); hair bulb muscle is not the right name for this muscle.

Question 10 (Portion of hair projecting from scalp)

The hair shaft is the part of the hair that is visible above the skin (projects from the scalp surface). The hair bulb is the base (growing part), matrix is the area of cell division in the bulb, and the root is the part below the surface (embedded in the skin). So the shaft is the projecting part.

Answer:

A. arrector pili muscle