| December 8, 2015

Caffeine is a stimulant that works because it acts as __________ to the adenosine receptors in a person�s brain, and stimulates __________ in that person�s heart and liver that increases blood flow and blood glucose.

a. an alloster; a pathway

b. an inhibitor; a cascade pathway

c. an inhibitor; ligands

d. a signal; inhibitors

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