Which of the following cell types could be found in the dermis?
monocytes, reticulocytes, and osteocytes
osteoblasts, osteoclasts, and epithelial cells
fibroblasts, macrophages, and mast cells
goblet cells, parietal cells, and chondrocytes
The Correct Answer is C
A. monocytes, reticulocytes, and osteocytes: Monocytes circulate in the blood, reticulocytes are immature red blood cells, and osteocytes are found in bone tissue. None of these are resident cells in the dermis.
B. osteoblasts, osteoclasts, and epithelial cells: Osteoblasts and osteoclasts are involved in bone formation and resorption, and epithelial cells form layers lining surfaces. These cells are not characteristic of dermal connective tissue.
C. fibroblasts, macrophages, and mast cells: Fibroblasts produce collagen and extracellular matrix, macrophages perform phagocytosis, and mast cells release histamine during inflammation. All are common resident cells in the dermis, contributing to structure, immunity, and tissue repair.
D. goblet cells, parietal cells, and chondrocytes: Goblet cells secrete mucus in epithelial linings, parietal cells are found in the stomach lining, and chondrocytes are located in cartilage. These cell types are not present in the dermis.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is E
Explanation
A. tight junctions:Tight junctions form a seal between epithelial cells, preventing leakage of substances between them and helping maintain distinct apical and basal cell surfaces. They are essential for barrier functions in epithelial tissue.
B. gap junctions:Gap junctions provide channels for communication and ion exchange between cells rather than strong attachment. While important for coordination, they are not the main structures that firmly hold epithelial cells together.
C. desmosomes:Desmosomes are anchoring junctions that strongly attach epithelial cells to each other, providing structural integrity and resistance to mechanical stress. They are vital in tissues subject to stretching.
D. both A and B:While tight junctions are involved in attachment, gap junctions serve mainly for communication rather than physical adhesion.
E. both A and C:Epithelial cells are held together primarily by tight junctions for sealing and desmosomes for strength, combining barrier function with mechanical support.
Correct Answer is A
Explanation
A. accumulate the melanin granules on their superficial portion, forming a UV-blocking pigment layer:Keratinocytes take up melanin granules produced by melanocytes and position them above the nucleus. This arrangement shields nuclear DNA from harmful UV radiation, reducing the risk of mutations and cellular damage.
B. provide the melanocyte with nutrients necessary for melanin synthesis:Nutrients for melanocyte function are delivered through blood supply in the dermis rather than directly by keratinocytes. Keratinocytes do not supply essential substrates for melanin production.
C. maintain the appropriate pH in order for the melanocyte to synthesize melanin granules:pH balance in the skin is regulated mainly by sweat and sebaceous secretions. Keratinocytes do not directly control melanocyte pH for melanin synthesis.
D. maintain the appropriate temperature so the product of the melanocyte will not denature:Temperature regulation is largely a function of dermal blood flow and sweat glands. Keratinocytes do not control melanocyte temperature or prevent denaturation of melanin.
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