1.Why
use a water flea as a model organism, and why not something else?
2. Why does caffeine increase heart rate?
its
stimulant properties. Caffeine takes about 45 minutes to be absorbed into the bloodstream. Once there, caffeine can make its way to the heart, where it acts
as a stimulant by binding, or attaching itself to, specific receptors on the
heart tissues causing the heart rate to increase.
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