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eMind Invertebrate Quick Reference Sheet
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Daphnia Heart Rate Lab
Name:
Date:
Period:
Purpose:
To determine the effect of various drugs on the heart rate in Daphnia.
Procedure:
Count the number of heartbeats in one minute to determine the normal heart rate. Then determine how each of the four drugs affects heart rate. Select a drug by clicking on a bottle. Then drag the dropper over the beating Daphnia heart and click again to release the drug. Record your data in the table below. Click on the word Normal on the data table to restore the normal heart rate.
Data:
Drug
Heartbeats per
minute
Normal
Nicotine
Alcohol
Sleep Aid
Caffeine
Analysis:
Graph your results.
Heart Rate - Beats/minute
180
160
140
120
100
80
60
40
20
0
Normal
Nicotine
Alcohol
Sleep Aid
Caffeine
Drug
Conclusion:
1. How did the different drugs affect the Daphnia's heart rate?


2. A stimulant is a drug that increases physiological activity, such as heart rate. Which drug(s) would be considered a stimulant?

3. A depressant is a drug that decreases physiological activity, such as heart rate. Which drug(s) would be considered a depressant?