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 A
Explanation
A. chondrocyte:Chondrocytes are specialized cells found in cartilage tissue. They produce and maintain the cartilaginous extracellular matrix and are not present in areolar connective tissue.
B. mast cell:Mast cells are abundant in areolar connective tissue and play a key role in inflammation by releasing histamine and other chemical mediators during immune responses.
C. macrophage:Macrophages are present in areolar connective tissue, where they function in phagocytosis to remove pathogens, debris, and damaged cells.
D. fibroblast:Fibroblasts are the most common cells in areolar connective tissue. They produce fibers such as collagen and elastin, as well as the extracellular matrix that provides structural support.
Correct Answer is B
Explanation
A. Mature adipose cells are highly mitotic:Mature adipocytes do not actively divide. Instead, new adipocytes are formed from precursor cells, and mature ones primarily increase in size rather than number.
B. Its primary function is to store triglycerides:Adipose tissue serves mainly as an energy reservoir by storing triglycerides. It also provides insulation, cushioning, and contributes to endocrine functions by releasing hormones like leptin.
C. Most of the cell volume is occupied by the nucleus:In adipocytes, the nucleus is pushed to the periphery of the cell by a large lipid droplet. The majority of the cell volume is taken up by stored fat, not the nucleus.
D. It is composed mostly of extracellular matrix:Unlike connective tissues such as bone or cartilage, adipose tissue has relatively little extracellular matrix. The tissue is mainly composed of densely packed fat cells.
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