QUESTIONS AND CORRECT ANSWERS
What cells in the dermis have a role in blood clotting after injury?
1. fibroblasts
2. langerhans cells
3. macrophages
4. mast cells - CORRECT ANSWER mast cells
-Mast cells contain heparin and histamine and proved cellular defense in mechanisms such as blood
clotting during injury
Which of the following can disrupt the acid mantle?
1. use of alkaline soaps
2. use of moisture barriers
3. Use of moisturizers
4. use of PH-balanced skin cleansers - CORRECT ANSWER use of alkaline soaps
-disruption of the acid mantle can occur due to over washing of the skin, frequent used of alkaline
soaps, exposure to incontinence and perspiration, and skin conditions.
What is the function of melanin? - CORRECT ANSWER UV radiation protection Melanin
provides a physical barrier to scatter UVR and acts as an absorbent filter to decrease the amount of
UVR penetration
Other than the skin, what 2 organs are part of the metabolic pathway for the production of vitamin D?
- CORRECT ANSWER Liver and Kidney
,-The skin contains a vit D precursor that is changed to cholecalciferol by the sun's UV rays.
Cholecalciferol follows a metabolic pathway through the liver where it is converted to calcidiol which
is then converted to active Vit D3 by the kidneys
What term is used to describe to temperature maintenance by the body? - CORRECT
ANSWER thermoregulation
-The primary mechanisms for thermoregulation are circulation and sweating.
What is the outermost superficial layer of the epidermis? - CORRECT ANSWER stratum
corneum
-The outermost layer of dead skin cells that sheds daily and acts as an outer covering to the skin.
What environmental element is needed for the skin to produce Vit D - CORRECT
ANSWER UV rays
How would you characterize the vascularity of the epidermis? - CORRECT ANSWER Not
vascularized
-Made mostly of dead cells
What cells in the epidermis divides into 2 daughter cells? - CORRECT ANSWER Melanocytes
-One remains in the stratum germinativum and the other moves to the surface of the epidermis, which
takes about 28 days
What protein is responsible for making the epidermis tough? - CORRECT ANSWER Keratin
-A fibrous protein that makes the epidermis tough
, What layers of the skin is affected when blisters form?
1. basement membrane zone
2. dermis
3. epidermis
4. sub q - CORRECT ANSWER basement membrane zone (BMZ)
-The BMZ is the layer affected when a blister forms as the epidermis and dermis separate from
shearing or friction, allowing fluid to collect between the two layers.
How would you characterize the vascularity of the dermis? - CORRECT ANSWER highly
vascularized
-The dermis is made of thick, dense, fibroelastic connective tissue and is highly vascularized
What layer of the skin contains nerves, sweat glands, and hair follicles?
1. papillary layer
2. reticular layer
3. stratum corneum
4. stratum germinativum - CORRECT ANSWER reticular layer
Which of the following is a difference in the characteristics of darker skin compared with lighter skin?
- CORRECT ANSWER collagen bundles are more compact
-Compact collagen bundles, longer BMZ, increase TEWL and higher number of fibroblasts
How does healthy fascia appear?
1. Grey and stringy