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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.
The increase in your heart rate from caffeine consumption can take effect in as soon as 15 minutes, and can take approximately six hours to wear off. Caffeine is not stored in your body, but is eventually excreted when you urinate.nce consumed, caffeine enters your blood from the stomach and small intestine and begins to stimulate your central nervous system. Caffeine stimulates receptors located in cells within your heart to increase your heart rate.