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In this context, caffeine can increase the heart beats of many organisms. Caffeine binds to receptors on the surface of heart muscle cells which leads to an increase in the level of cAMP inside the cells which then increases the heart rate. This creates an overall effect to increase the rate of glycolysis and the amount of ATP available for muscle contraction and relaxation.
Caffeine stimulates the central nervous system by binding in areas that are reserved for substances that inhibit neuronal firing. This results in a decrease in reaction time and perception of fatigue, and an increase in alertness. Caffeine blocks an enzyme that breaks down cyclic adenosine monophosphate (C-AMP). High levels of C-AMP increase lipolysis, which results in the release of free fatty acids into the blood stream. Muscle cells then absorb the free fatty acids and use them for energy production.