Question

6.2 accessory structures of skin (p. 191-6)
what is the major difference between the hair shaft and a hair follicle?
acne is caused by the over production of sebum (oil) by which gland?
describe the function eccrine sweat glands.

Explanation:

1. Eccrine sweat glands help regulate body temperature by producing sweat, which cools the body through evaporation. They also excrete small amounts of waste products like urea and salts.
2. Acne is caused by the over - production of sebum by sebaceous glands. These glands are attached to hair follicles and secrete sebum to lubricate the skin and hair.
3. The major difference between the hair shaft and hair follicle: The hair shaft is the visible part of the hair that extends above the skin surface, composed of dead, keratinized cells. The hair follicle is a tube - like structure in the skin from which the hair grows, containing living cells and is involved in hair growth, nourishment, and renewal.

Answer:

1. Eccrine sweat glands regulate body temperature and excrete waste.
2. Acne is caused by over - production of sebum by sebaceous glands.
3. The hair shaft is the visible, dead part above the skin, while the hair follicle is the living, skin - embedded structure for hair growth.