Texas Class A Barber Written ExamAnatomy and PhysiologyMedium
A client complains of significant hair loss and thinning. Upon examination, the barber notes the remaining hair appears dull and brittle. This could indicate a deficiency in the body's ability to synthesize keratin, which is the primary protein component of hair, skin, and nails. Keratin synthesis is primarily a function of:
- Afibroblast cells in the dermis.
- Badipocytes in the subcutaneous tissue.
- Ckeratinocyte cells in the epidermis.
- Dmelanocytes in the epidermis.
Show answer & explanationAnswer & explanation
Correct answer: C. keratinocyte cells in the epidermis.
Keratinocytes are the most abundant cells in the epidermis and are responsible for producing keratin. They undergo a process of keratinization as they move upwards, eventually forming the protective outer layers of the skin and hair.
Why the other options are wrong
- A. Fibroblast cells produce collagen and elastin, which are connective tissue proteins, not keratin.
- B. Adipocytes are fat cells found in the subcutaneous tissue, primarily for energy storage and insulation, not keratin synthesis.
- D. Melanocytes produce melanin, which is responsible for skin and hair color, not keratin.
Keratinocyte Function
Keratinocytes are epidermal cells that produce keratin, a fibrous protective protein that forms the structural basis of hair, skin, and nails.
- Most abundant cell type in the epidermis.
- Undergo continuous division and differentiation.
- Key for skin's barrier function.
Memory trick: Keratinocytes create keratin, keeping skin strong and sleek.