Question

question 4 (1 point)
what is the phase of the hair growth cycle in which the hair can shed?
o a nitrogen phase
b anagen phase
o c telogen phase
d catagen phase

question 5 (1 point)
which portion of the hair root structure supplies nutrients so that the hair can grow?
o a the arrector pili
b the hair bulb
o c the dermal papilla
d the hair follicle

question 6 (1 point)
which layer of the hair shaft provides strength, elasticity, and color?
o a the hair cuticle
b the hair fiber
o c the cortex
d the medulla

Explanation:

• Question 4: The hair growth cycle has three main phases. The telogen phase is the resting phase. During this phase, the hair follicle is dormant, and the hair can shed. The anagen phase is the growth phase, the catagen phase is the transitional phase, and there is no “nitrogen phase” in the hair growth cycle.
• Question 5: The dermal papilla is a structure within the hair root. It contains blood vessels that supply nutrients to the hair bulb (where hair growth occurs). The arrector pili is a muscle, the hair follicle is the structure that houses the hair, and while the hair bulb is where growth happens, it gets nutrients from the dermal papilla.
• Question 6: The cortex of the hair shaft contains keratin (for strength and elasticity) and melanin (for color). The cuticle is the outer protective layer, there is no “hair fiber” as a distinct structural layer in the standard hair - shaft anatomy, and the medulla is the innermost layer (not primarily responsible for strength, elasticity, and color).

Answer:

• Question 4: C. telogen phase
• Question 5: C. the dermal papilla
• Question 6: C. the cortex