Can Light Control Heart Rate

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Data Analysis .............................................page 17

Conclusion ...............................................page 19

Bibliography .............................................page 21

Question:

Do red light, blue light, and UV light affect the heart rate of Daphnia magna?

Variables:

Manipulated Variable: The different types of light shone on the Daphnia.

Responding Variable: The change in heart rate when each Daphnia is exposed to different types of light.

Controlled Variables: The same amount of light exposed to each Daphnia magna, and the same amount of time exposed to each Daphnia magna.

Hypothesis:

If Daphnia magna are exposed to red, blue, and UV light, the heart rate of the Daphnia magna will vary because other studies have shown the defense mechanism and behavior changes when exposed to UV light.

Background Research:

Testing The Heart Rate of Daphnia Magna

A recent study in ...

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to apply this technique in the diagnosis and treatment of heart diseases in patients, and could possibly even replace beta blockers and artificial pacemakers in the future.
Daphnia, commonly known as water flea, are found everywhere, from acidic swamps to lakes around the world ("Daphnia."). Their common name (water fleas) comes from their jerky swimming motion and general appearance, very similar to land fleas ("Daphnia pulex."). Adult Daphnia sizes generally range from one millimeter to five millimeters and their most noticeable feature is their body, which is transparent ("Daphnia."). Their bodies are transparent because of their carapace, a folded shell-like structure that covers ...

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