Daphnia - Transparent invertebrates (see their internal organs) you can monitor their heart rate (number of heart beats per minutes) by observing through telescope.
1. Make a range of different concentration solutions including contol solution.
2. One Daphnia on cavity slide (in the dimple).
3. Place on microsope and focus on the heart.
4. Small drop of caffein solution on the daphnia.
5. Count number of heart beats in 10 seconds and multiply by 6.
6. Repeat 10 times (same solution, different daphnia).
7. Keep all other factors constant.
8. Repeat with all other concentrations.
9. Compare the results.
Graph: Average of 10 readings, plot graph. Should show positive correlation, as caffeine increases, heart rate increases.
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