Which of the following contain valves? Check all that apply.
heart
arteries
veins
capillaries
Correct Answer : A,C
A. heart: Has atrioventricular (mitral/tricuspid) and semilunar (aortic/pulmonic) valves.
B. arteries: Systemic arteries generally lack valves (the aortic/pulmonic “valves” are cardiac valves at the heart outflow, not within the arterial tree).
C. veins: Especially in limbs; valves prevent backflow and aid venous return.
D. capillaries: Capillaries are single-layer vessels without valves.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is {"dropdown-group-1":"B","dropdown-group-2":"B"}
Explanation
A. lipase; lipids: lingual lipase (from tongue) begins lipid digestion, but major salivary secretion is amylase, not lipase.
B. amylase; carbohydrates: salivary (ptyalin) amylase begins digestion of starches (carbohydrates) into smaller sugars.
C. pepsin; proteins: pepsin is secreted as pepsinogen by the stomach, not salivary glands.
D. sucrase; sucrose: sucrase is a brush-border (intestinal) enzyme, not a major salivary gland secretion.
Correct Answer is C
Explanation
A. Pepsin: pepsin is a stomach protease that digests proteins, not starch.
B. Mucus: mucus lubricates and protects tissues but does not chemically digest starch.
C. Salivary amylase: salivary amylase (ptyalin) begins starch digestion in the mouth, producing maltose/oligosaccharides that taste sweet.
D. Bicarbonate ions: bicarbonate neutralizes acid but does not break down starch.
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