NIC Barber Written (Theory) ExamScientific ConceptsEasy
A barber is explaining the basic structure of the skin to a new apprentice. Which layer of the skin is primarily responsible for producing keratin and acts as the body's main protective barrier against the environment?
- ADermis
- BEpidermis
- CHypodermis
- DSubcutaneous tissue
Show answer & explanationAnswer & explanation
Correct answer: B. Epidermis
The epidermis is the outermost layer of the skin, composed primarily of keratinocytes that produce keratin, forming a strong, protective barrier against pathogens, UV radiation, and water loss.
Why the other options are wrong
- A. The dermis is the middle layer, containing connective tissue, hair follicles, and sweat glands, but not the primary barrier.
- C. The hypodermis (subcutaneous tissue) is the innermost layer, primarily fat and connective tissue, for insulation and shock absorption.
- D. Subcutaneous tissue is another name for the hypodermis, which is not the primary protective barrier.
Epidermis
The outermost layer of the skin, providing the primary protective barrier.
- Composed mainly of keratinocytes.
- Produces keratin, a tough, fibrous protein.
- Acts as a barrier against pathogens, UV, and water loss.
Memory trick: Epi-dermis: The 'epic' outer shield.