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.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. stratum granulosum:The stratum granulosum is usually present in most areas of the epidermis. It contains keratohyalin granules that contribute to keratin formation, which helps strengthen the skin barrier.
B. stratum lucidum:The stratum lucidum is a clear layer found only in thick skin, such as the palms of the hands and soles of the feet. It is absent in most of the body’s epidermis, which is classified as thin skin.
C. stratum corneum:The stratum corneum, composed of layers of dead keratinized cells, is always present in the epidermis. It serves as the outer protective layer against environmental factors.
D. stratum basale:The stratum basale is the deepest layer of the epidermis. It contains dividing keratinocytes and melanocytes and is always present to support skin regeneration.
E. stratum spinosum:The stratum spinosum lies above the basal layer and provides strength and flexibility to the skin. It is consistently present in the epidermis across most of the body.
Correct Answer is C
Explanation
A. acetyl CoA:Acetyl CoA is a critical intermediate in cellular respiration that enters the Krebs cycle. However, it is not the primary fuel source but rather a product derived from the breakdown of carbohydrates, fats, or proteins.
B. protein:Proteins can be used for energy when carbohydrates and fats are scarce, but they are primarily reserved for structural and functional roles such as enzyme production and tissue repair. Their breakdown for energy is less efficient and not the main source of fuel.
C. glucose:Glucose is the body’s preferred and most readily available fuel for cellular respiration. It undergoes glycolysis, the Krebs cycle, and oxidative phosphorylation to produce ATP efficiently, making it the main energy substrate under normal conditions.
D. fat:Fats provide a large energy reserve and yield more ATP per molecule than glucose, but they must undergo beta-oxidation before entering respiration pathways. They are slower to mobilize and not considered the immediate source of fuel.
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