Caffeine is a stimulant that works because it acts as a(n) _______ 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) effector; a pathway
B) inhibitor; a cascade pathway
C) inhibitor; a ligand
D) signal; inhibitors
E) pathway; a ligand

Question

Quizplus · Accepted Answer

Caffeine is an inhibitor to adenosine receptors in the brain, which normally bind to adenosine and cause drowsiness. By blocking these receptors, caffeine helps to keep a person alert. Caffeine also stimulates a cascade pathway in the heart and liver, which leads to increased blood flow and blood glucose levels.

Caffeine Is a Stimulant That Works Because It Acts as A(n)