Which cells are commonly found wedged between simple columnar epithelial cells and secrete mucus?
goblet cells
mast cells
fibroblasts
macrophages
The Correct Answer is A
A. goblet cells: Goblet cells are specialized epithelial cells interspersed among simple columnar cells. They secrete mucus that lubricates and protects the lining of organs such as the intestines and respiratory tract.
B. mast cells: Mast cells are found in connective tissue, where they release histamine and other chemical mediators during immune responses. They are not embedded within epithelial layers.
C. fibroblasts: Fibroblasts are connective tissue cells that produce collagen and extracellular matrix. They do not secrete mucus or reside within epithelial layers.
D. macrophages: Macrophages are immune cells present in connective tissue and the bloodstream that perform phagocytosis. They are not positioned between epithelial cells for mucus secretion.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. stratum basale:This is the deepest layer of the epidermis, consisting of mitotically active basal cells. Its main function is cell division and replacement of superficial layers, not the initiation of keratinization.
B. stratum lucidum:This clear layer is found only in thick skin, such as the palms and soles. It contains densely packed keratin, but keratinization has already occurred before this stage.
C. stratum spinosum:Cells in this layer begin producing keratin and keratohyalin, initiating the process of keratinization. The spiny appearance of the cells is due to desmosomal attachments, which help strengthen the epidermis.
D. stratum corneum:This outermost layer is composed of fully keratinized, dead cells. By this stage, keratinization is complete, and cells are flattened, providing a protective barrier.
Correct Answer is C
Explanation
A. conversion of glucose into carbon dioxide and water:This describes the complete process of cellular respiration, including the Krebs cycle and electron transport chain, not glycolysis.
B. formation of sugar:Glycolysis does not form sugar; it breaks down glucose molecules into smaller intermediates to release energy.
C. conversion of glucose into two molecules of pyruvic acid:Glycolysis involves the breakdown of one glucose molecule (6 carbons) into two pyruvic acid molecules (3 carbons each). This catabolic process releases a small amount of ATP and NADH.
D. conversion of pyruvic acid into carbon dioxide and water:This occurs during the later stages of cellular respiration, specifically the Krebs cycle and oxidative phosphorylation, rather than during glycolysis itself.
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