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The aim of this investigation is to investigate the affect of caffeine on the heart rate of Daphnia (Water Fleas).
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Activity 1.21 Does Caffeine Affect the Heart Rate? Aim: The aim of this investigation is to investigate the affect of caffeine on the heart rate of Daphnia (Water Fleas). Hypothesis: The heart rate of the Daphnia will increase when exposed to caffeine. Caffeine acts as a stimulant, which causes stimulatory neurotransmitters to be released in excess amounts. This makes the brain feel more alert and also increases mental activity. Therefore an increase in the heart rate is likely if more physical activity is taking place. Method: 1. Set up apparatus needed- 6 Daphnia, cavity slides, dropping pipettes, distilled water, caffeine tablets, cotton wool, glass beakers, test tubes, test tube rack, stop clock, filter paper, and microscope. 2. After equipment is set us, collect 6 Daphnia. Place 3 into pond water and 3 into caffeine solution. 3. Then place a thin layer of cotton wool onto the slides under the microscope. 4....
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