Which structure is not associated with a hair?
a. Shaft
b. Cortex
c. Matrix
d. Cuticle
e. Lunule

The portion of the hair that projects from the surface of the skin is the _____, and the portion within the dermis is the _______, which is embedded in a(n) _____.

The portion of the hair that contains cells that undergo mitosis during the growth stage of the hair is known as the _________.

Why don't you bleed when you cut your nails? Why don't you bleed when a hair is pulled?

Manufacturers of shampoos and conditioners often claim their products contain vitamins that are necessary to keep hair shafts healthy.

Do hair shafts need vitamins? (Hint: Vitamins are required for cells to carry out certain reactions.)

Why or why not? How valid are these claims?

The hair and nails are sometimes called accessory organs. Are these structures technically organs? Why or why not?

In investigating the cause of thinning hair, which of the following questions needs to be asked?

a. Is the diet deficient in proteins?

b. Is the person taking megadoses of vitamin C?

c. Has the person been exposed to excessive radiation?

d. Has the person recently suffered severe emotional trauma?

An arrector pili muscle

a. Is associated with each sweat gland

b. Can cause a hair to stand up straight

c. Enables each hair to be stretched when wet

d. Provides new cells for continued growth of its associated hair

The accessory structures of the integument include the

(a) Blood vessels, glands, muscles, and nerves

(b) Tactile discs, lamellar corpuscles, and tactile corpuscles

(c) Hair, skin, and nails

(d) Hair follicles, nails, sebaceous glands, and sweat glands

The portion of the hair follicle where cell divisions occur is the

(a) Shaft

(b) Matrix

(c) Root hair plexus

(d) Cuticle