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. Thyroid cartilage: Thyroid cartilage is a laryngeal cartilage (Adam’s apple), not the opening between the cords
B. Cricoid cartilage: Cricoid cartilage is a ring below the thyroid cartilage, not the opening between vocal cords
C. Alveoli: Alveoli are air sacs in the lungs, unrelated to vocal cord anatomy
D. Glottis: The glottis is the opening between the true vocal cords
Correct Answer is B
Explanation
A. Converts fibrinogen to fibrin: that reaction is carried out by thrombin, not plasmin.
B. Breaks down fibrin, dissolving the clot: plasmin is the primary enzyme of fibrinolysis, cleaving fibrin to dissolve formed clots.
C. Triggers the extrinsic clotting mechanism, leading to clot formation: the extrinsic pathway is initiated by tissue factor (factor III) interacting with factor VII, not plasmin.
D. Inactivates thrombin, slowing clot formation: plasmin’s main role is fibrin breakdown; thrombin is primarily regulated by antithrombin, thrombomodulin–protein C systems. (Plasmin can degrade some clotting proteins but it is not described as the main inactivator of thrombin.)
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