A student asks the physiology instructor why, when you put a cracker in your mouth, it tastes salty at first but then it tastes sweet. What should the physiology instructor answer?
A) "Crackers don't do that."
B) "Crackers are mostly starch, and all starch in foods does that."
C) "Ptyalin is contained in saliva. It is the enzyme that begins the digestion of starches."
D) "The water and mucus contained in saliva change the taste from salty to sweet."
Ans: C
Feedback: Ptyalin, or salivary amylase, is an enzyme that begins the digestion of starches. Option A is incorrect because it belittles the student asking the question. Option B is incorrect because it negates the student's question, making it superfluous. Option D is incorrect because it is the ptyalin, not the water and mucus in the saliva, that begins the digestion of starches that we eat.
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