Texas Class A Barber Written ExamAnatomy and PhysiologyHard
A barber notices a client's scalp exhibiting signs of poor circulation, including a pale appearance and slow wound healing. Which component of the dermis is primarily responsible for supplying the necessary nutrients and oxygen to the epidermis and hair follicles, and removing waste products?
- AArrector pili muscles
- BBlood and lymph vessels
- CCollagen and elastin fibers
- DSensory nerve endings
Show answer & explanationAnswer & explanation
Correct answer: B. Blood and lymph vessels
The dermis is richly supplied with blood and lymph vessels. Blood vessels deliver oxygen and nutrients to the actively growing cells of the epidermis and hair follicles, as well as remove waste. Lymph vessels help drain interstitial fluid and immune responses. Poor circulation directly impacts these vital functions.
Why the other options are wrong
- A. Arrector pili muscles cause hair to stand on end (goosebumps) and are not involved in nutrient transport.
- C. Collagen and elastin provide strength and elasticity to the skin, but do not directly supply nutrients or remove waste.
- D. Sensory nerve endings are responsible for touch, pain, and temperature sensation, not nutrient supply.
Dermal Vascular Supply
The dermis contains an extensive network of blood and lymph vessels that are essential for nourishing the epidermis and hair follicles, regulating temperature, and supporting immune functions.
- Blood vessels deliver O2 and nutrients, remove CO2 and waste.
- Lymph vessels drain fluid and transport immune cells.
- Crucial for skin health, healing, and hair growth.
Memory trick: Dermal bloodlines deliver life's essential flow.