What is a function of saliva?
Absorbing fat from ingested food
Breaking food into smaller pieces
Beginning the chemical digestion of carbohydrates
Cleansing the esophagus
The Correct Answer is C
A. Absorbing fat from ingested food: saliva does not absorb fat; lipid processing occurs later (emulsification by bile, digestion by lipase).
B. Breaking food into smaller pieces: Incorrect (partly true) -mastication (teeth and jaw) breaks food down; saliva lubricates and moistens but does not mechanically triturate alone.
C. Beginning the chemical digestion of carbohydrates: saliva contains salivary amylase, which begins starch digestion into smaller sugars.
D. Cleansing the esophagus: saliva helps cleanse the mouth and aids swallowing, but it does not “cleanse the esophagus” as a primary function.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is {"dropdown-group-1":"B"}
Explanation
Correct answer: Median cubital vein
The vein running diagonally across the anterior elbow (antecubital fossa) is the median cubital vein, the usual communicating vein between cephalic and basilic veins and a common site for venipuncture.
Correct Answer is A
Explanation
A. The AV valves are closing: This occurs at S₁ (first heart sound) at the start of ventricular systole.
B. The semilunar valves are closing: Semilunar valves close at S₂ (second heart sound), not S₁.
C. The AV valves are opening: AV valves open during ventricular diastole (filling), not at S₁.
D. The semilunar valves are opening: Semilunar valves open during ventricular ejection (systole) but their opening is not what produces S₁.
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