In addition to protection as a physical and chemical barrier, the skin serves other functions. Which of the following is another vital function of the skin?
The cells of the epidermis store glucose as glycogen for energy.
It converts modified epidermal cholesterol to a vitamin D precursor important to calcium metabolism.
It absorbs vitamin C so that the skin will not be subject to diseases.
It aids in the transport of materials throughout the body.
The Correct Answer is B
A. The cells of the epidermis store glucose as glycogen for energy: Epidermal cells do not function as a significant glucose storage site. Glycogen storage occurs primarily in the liver and skeletal muscle, not in the skin.
B. It converts modified epidermal cholesterol to a vitamin D precursor important to calcium metabolism: The skin plays a critical role in synthesizing vitamin D. UVB radiation converts 7-dehydrocholesterol in the epidermis to cholecalciferol (vitamin D3), which is essential for calcium absorption and bone health.
C. It absorbs vitamin C so that the skin will not be subject to diseases: While vitamin C is important for collagen synthesis and skin health, the skin does not actively absorb vitamin C from the environment. Dietary intake is the primary source.
D. It aids in the transport of materials throughout the body: The skin does not serve as a transport system for materials like blood vessels do. Its role is mainly protective, sensory, and metabolic, not circulatory.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. glycogenesis:Glycogenesis is the process of converting glucose into glycogen for storage in the liver and muscles. When an endurance runner “carbo-loads,” she increases glycogen stores to provide a readily available energy source during prolonged exercise.
B. glycolysis:Glycolysis is the breakdown of glucose into pyruvate to produce ATP for immediate energy needs. It does not refer to storing glucose for future use, as occurs during carbo-loading.
C. gluconeogenesis:Gluconeogenesis is the formation of glucose from noncarbohydrate sources such as amino acids and glycerol, typically occurring during fasting or low-carbohydrate intake, not during carbohydrate loading.
D. glycogenolysis:Glycogenolysis is the breakdown of glycogen into glucose to supply energy during fasting or exercise, which is the opposite of the storage process during carbo-loading.
Correct Answer is A
Explanation
True:Vellus hair is soft, fine, and lightly pigmented, covering much of the body surface. It is most noticeable in children and adult females, where it serves a protective function without providing significant insulation.
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