Which layer of the digestive tract is composed of epithelial tissue and may contain folds and mucus-secreting glands?
Submucosa
Muscularis
Mucosa
Serosa
The Correct Answer is C
A. Submucosa: submucosa is connective tissue containing blood/lymph vessels and glands, not the epithelial lining.
B. Muscularis: muscularis is smooth muscle (inner circular/outer longitudinal layers) responsible for peristalsis, not epithelial.
C. Mucosa: the mucosa includes the epithelial lining, lamina propria, and may contain folds and mucus-secreting glands (e.g., gastric mucosa).
D. Serosa: serosa is the outermost connective tissue/mesothelial covering of the gut, not the epithelial absorptive/secreting layer.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. stomach: the stomach is an organ of the alimentary canal (not an accessory organ).
B. pharynx: the pharynx is part of the alimentary canal (passageway), not an accessory organ.
C. esophagus: the esophagus is part of the alimentary canal (conduit), not accessory.
D. pancreas: the pancreas is an accessory organ (secretes digestive enzymes and bicarbonate into the duodenum).
Correct Answer is A
Explanation
A. To produce antibody molecules: plasma cells are differentiated B cells specialized for synthesizing and secreting antibodies.
B. To directly attack cells displaying antigens: cytotoxic T lymphocytes (and NK cells) directly attack antigen-bearing cells; plasma cells primarily secrete antibodies.
C. To increase the volume of the blood plasma: plasma cell activity does not change plasma volume; they produce proteins (antibodies), not fluid volume.
D. To produce interferon: many cell types secrete interferons in response to viral infection (e.g., infected cells, immune cells), but plasma cells are dedicated antibody producers.
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