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Investigation into the effects of caffeine on pulse rate.
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| Submitted: Mon Aug 18 2003
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Investigation into the effects of caffeine on pulse rate Introduction: I am going to do an experiment to see how caffeine affects my pulse rate. I will drink coffee and coke, and compare how much my pulse increases when each drink is consumed. Background knowledge: Caffeine is classed as a central nervous system stimulant. Stimulants affect the brain by either increasing or decreasing its activity. It is thought that they work on the synapses in the brain. There are millions of nerve fibres in the brain, and millions of connections between them, called synapses. Nerve impulses cross synapses by messenger molecules. Caffeine is a stimulant because they cause the release of more messenger molecules than normal. In moderate doses, caffeine can: increase alertness, reduce fine motor co-ordination, alter sleep patterns, and cause serious headaches, nervousness and dizziness. In massive doses caffeine is lethal. Caffeine enters the bloodstream through the stomach and...
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