When asking pathophysiology students, "Why do sebaceous glands secrete sebum?" the student with the correct answer would be:
A) To lubricate skin and hair
B) To supply energy in the form of fibrous protein
C) To increase water amounts released via perspiration
D) To supply a nutritional source for vitamin D
Ans: A
Feedback:
Sebaceous glands secrete sebum, an oily mixture consisting of lipids, including triglycerides, cholesterol, and wax, that lubricates hair and skin. Keratinocytes of the epidermis produce a fibrous protein called keratin, which is essential to the protective function of skin. Sweat glands produce watery secretions. The dermis supports the epidermis and serves as its primary source of nutrition.
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