Skincare Skin Anatomy and Physiology 1 — Questions and Answers
Question 1: Which layer of the skin is the outermost and acts as the primary barrier against the environment?
- Dermis
- Hypodermis
- Epidermis (Correct answer)
- Subcutaneous layer
Correct answer: Epidermis
The epidermis is the outermost layer of skin and serves as the primary physical and chemical barrier.
Question 2: What cells in the epidermis are responsible for producing melanin?
- Keratinocytes
- Melanocytes (Correct answer)
- Langerhans cells
- Merkel cells
Correct answer: Melanocytes
Melanocytes produce melanin, the pigment responsible for skin color and UV protection.
Question 3: Which protein is the primary structural component of the epidermis?
- Collagen
- Elastin
- Keratin (Correct answer)
- Fibronectin
Correct answer: Keratin
Keratin is the main structural protein found in the epidermis, providing strength and waterproofing.
Question 4: The dermis layer contains which of the following structures?
- Melanocytes only
- Stratum corneum
- Hair follicles and sweat glands (Correct answer)
- Adipose tissue only
Correct answer: Hair follicles and sweat glands
The dermis contains hair follicles, sweat glands, sebaceous glands, blood vessels, and nerve endings.
Question 5: What is the normal pH range of healthy skin?
- 6.5–7.5
- 4.5–5.5 (Correct answer)
- 3.0–4.0
- 7.0–8.0
Correct answer: 4.5–5.5
Healthy skin has a slightly acidic pH of 4.5–5.5, which helps maintain the skin's protective acid mantle.
Question 6: Which sublayer of the epidermis is responsible for new cell production through mitosis?
- Stratum corneum
- Stratum granulosum
- Stratum basale (Correct answer)
- Stratum spinosum
Correct answer: Stratum basale
The stratum basale (basal layer) is the deepest epidermal layer where keratinocytes are produced by mitosis.
Skincare Skin Anatomy and Physiology 1
Which layer of the skin is the outermost and acts as the primary barrier against the environment?