A dendritic cell is a specialized
squamous epithelial cell
muscle cell
melanocyte
nerve cell
macrophage
The Correct Answer is E
A. squamous epithelial cell: Squamous epithelial cells form flat layers of tissue that provide a protective barrier. They are not involved in antigen presentation or immune surveillance like dendritic cells.
B. muscle cell: Muscle cells are specialized for contraction and movement. They do not participate in immune responses or capture antigens, so they are not related to dendritic cell function.
C. melanocyte: Melanocytes produce melanin to protect the skin from UV damage. While both are found in the epidermis, dendritic cells function in immune defense rather than pigmentation.
D. nerve cell: Nerve cells transmit electrical signals to communicate sensory or motor information. They do not process antigens or trigger immune responses, unlike dendritic cells.
E. macrophage: Dendritic cells are specialized antigen-presenting cells closely related to macrophages. They capture, process, and present antigens to T cells, initiating adaptive immune responses in the skin and other tissues.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. bone (osseous) tissue:Bone tissue contains lacunae that house osteocytes, a hard matrix rich in calcium salts for structural support, and is highly vascularized, allowing nutrients and waste to be transported through blood vessels.
B. fibrocartilaginous tissue:Fibrocartilage contains lacunae with chondrocytes but lacks blood vessels and has a less rigid matrix compared to bone, limiting its nutrient supply and healing capacity.
C. cartilage tissue:Cartilage in general contains lacunae with chondrocytes and a flexible matrix, but it is avascular, relying on diffusion for nutrient delivery rather than direct blood supply.
D. areolar tissue:Areolar connective tissue is loose and highly vascular, but it does not have lacunae or calcium-rich matrix. It primarily provides support, cushioning, and elasticity rather than rigid structural support.
Correct Answer is A
Explanation
A. Electron transport chain/oxidative phosphorylation:This stage of cellular respiration produces the majority of ATP, typically about 26–34 molecules per glucose. It relies on the transfer of electrons through protein complexes and the use of a proton gradient to drive ATP synthase activity.
B. oxidation reactions:Oxidation reactions remove electrons from molecules, often transferring them to NAD⁺ or FAD. While essential for energy extraction, these reactions alone do not directly generate large amounts of ATP.
C. substrate-level phosphorylation:This mechanism occurs during glycolysis and the Krebs cycle, producing ATP directly from enzyme-mediated reactions. However, it only accounts for a small fraction of ATP yield, about 2 ATP in glycolysis and 2 in the Krebs cycle.
D. lactic acid production:Lactic acid is formed in anaerobic respiration when pyruvate is reduced to lactate. This process regenerates NAD⁺ for glycolysis but yields no additional ATP beyond the small amount produced in glycolysis itself.
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