Skincare Skin Anatomy and Physiology 2 — Questions and Answers
Question 1: What is the primary function of sebaceous glands?
- Regulate body temperature
- Produce sweat
- Secrete sebum to lubricate skin and hair (Correct answer)
- Produce collagen
Correct answer: Secrete sebum to lubricate skin and hair
Sebaceous glands secrete sebum, an oily substance that lubricates and waterproofs the skin and hair.
Question 2: Which structural protein gives skin its elasticity and ability to return to its original shape?
- Keratin
- Collagen
- Elastin (Correct answer)
- Hyaluronan
Correct answer: Elastin
Elastin fibers in the dermis provide skin with its elastic properties, allowing it to snap back after stretching.
Question 3: The hypodermis (subcutaneous layer) is primarily composed of which tissue?
- Muscle tissue
- Nerve tissue
- Adipose (fat) tissue (Correct answer)
- Epithelial tissue
Correct answer: Adipose (fat) tissue
The hypodermis is mainly composed of adipose tissue, which insulates the body and cushions organs.
Question 4: What is the approximate time for skin cell turnover (epidermal renewal) in a healthy adult?
- 7–10 days
- 14–21 days
- 28–30 days (Correct answer)
- 60–90 days
Correct answer: 28–30 days
In healthy adults, the skin completes a full cell turnover cycle approximately every 28–30 days.
Question 5: Which immune cells in the epidermis help defend against pathogens and play a role in allergic reactions?
- Merkel cells
- Melanocytes
- Keratinocytes
- Langerhans cells (Correct answer)
Correct answer: Langerhans cells
Langerhans cells are dendritic immune cells in the epidermis that capture antigens and present them to T cells.
Question 6: The acid mantle of the skin is formed by a combination of which secretions?
- Sebum and sweat (Correct answer)
- Collagen and elastin
- Melanin and keratin
- Hyaluronic acid and ceramides
Correct answer: Sebum and sweat
The acid mantle is a thin film formed by the mixture of sebum and sweat on the skin's surface.
Skincare Skin Anatomy and Physiology 2
What is the primary function of sebaceous glands?