LAYERS OF THE SKIN
Which skin cell produces melanin?
A. Keratinocyte
B. Melanocyte
C. Langerhans cell
D. Merkel cell
B-Melanocyte
Which gland produces sweat for temperature regulation?
A. Sebaceous gland
B. Apocrine gland
C. Eccrine gland
D. Ceruminous gland
Merocrine (eccrine gland)
The visible part of the hair above the skin surface is called the:
A. Root
B. Bulb
C. Shaft
D. Papilla
Shaft – The visible part of the hair above the skin surface.
WHICH LAYER CONTAINS BLOOD VESSELS AND NERVE ENDINGS?
A. Epidermis
B. Dermis
C. Hypodermis
D. Stratum corneum
B-dermis
Produce oily secretion
• Lubricant for skin and hair
• Bactericidal
• Discharges into a hair follicle
Sebaceous glands secrete what substance, and what is its function?
Hair papilla (dermal papilla)
The structure that provides blood supply and nutrients to growing hair is the:
Put these epidermal layers in correct order from deep to superficial:
Stratum basale
Stratum corneum
Stratum spinosum
Stratum granulosum
Stratum lucidum
Stratum basale
Stratum spinosum
Stratum granulosum
Stratum lucidum (only in thick skin like palms & soles!)
Stratum corneum
Compare eccrine and apocrine glands in terms of:
Location
Eccrine Glands- All over body. function-thermoregulation – cools body via watery sweat
Apocrine Glands-Armpits, groin, around nipples. contains lipids and proteins, can develop odor when bacteria break it down.
What is the function of the arrector pili muscle, and what physical response does it cause?
It is a small smooth muscle attached to each hair follicle. When it contracts, it pulls the hair upright.
example- Goosebumps.
Which of the following is NOT a function of the skin?
A. Protection
B. Vitamin D synthesis
C. Blood cell production
D. Temperature regulation
C-Blood cell production