Determining the Effects of Various Alcohol Levels on the Heart Rate of Daphnia

Overview

Objectives/Goals My objective was to find if alcohol is really a depressant. I'll determine this by using a daphnia's heartrate after being exposed to various alcohol rates (by volume). Methods/Materials I scooped up the daphnia with a spoon and placed on a single microscope slide then added 2-3 drops of 1 of my test liquids. I then counted the heartbeats for 10 seconds, and multiplied the result by 6 to get the heartrate for 1 minute. I tested alcohol levels of 1.2%, 5%, 10%, and 12% alcohol by volume. Results The alcohol increased the heart rate. The 12% alcohol level increased the heartrate the most. Conclusions/Discussion My hypothesis was wrong. The heartrate increased when exposed to the higher alcohol contents. This disproves the theory that alcohol is a cardiac depressant.

Competition history

• CSEF 2002 Pharmacology/ Toxicology · Entry J1439

Resources

• CSEF project summary ↗

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