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HypothesisIf more caffeine is consumed then heart rate and blood pressure will be higher than those of lower caffeine content because caffeine stimulates cells within the heart by binding to receptors thus causing heart rate to increase.
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VariablesThe independent variable in this experiment is the type of beverage (and therefore the amount of caffeine in each drink), and this will affect the heart rate and blood pressure, which are the dependent variables. The control for our experiment is measuring our initial blood pressure/heart rate and then our heart rate 20 minutes later without any caffeine intake. This will ensure that solely caffeine is affecting any significant changes in blood pressure and heart rate. The constants in our experiment is the time in which we need to drink the caffeine, the same type of blood pressure monitor used, and the blood pressure being taken in the same sitting position after the same amount of time of sitting.
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