DOES CAFFEINE AFFECT HEART RATE? - Edexcel
This can lead to heart and circulation problems. The effect of caffeine on heart rate can be investigated using Daphnia (water fleas). The beating heart of a water flea can be seen through its translucent body, by placing the flea in a few drops of water in a cavity slide under the microscope. A mobile phone can be used to video the heart beat.
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