Which of the following acts as the "first-line" or immediate defense against the accumulation of H+ ions?

a. Blood buffer system
b. GI tract
c. Renal system
d. Respiratory system


ANS: A
Bicarbonate and nonbicarbonate buffer systems are the immediate defense against the accumula-tion of H+ ions.

Health Professions

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Answer the following statement true (T) or false (F)

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The substance that aids in the breakdown of food in the mouth is called __________.

Fill in the blank(s) with the appropriate word(s).

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