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The heart rate of a Daphnia (water flea) Aims & Objectives To observe and test how the heart rate of a Daphnia water flea changes when the temperature of the surrounding water varies. I will count the heart rate of the Daphnia by observing it through a microscope. Background information The Daphnia water flea is a cold-blooded organism. This means it has absolutely no control over its own body temperature. Therefore it is cold in cold water and warm in warm water. It has a massively large heart rate. This is a labelled picture of a Daphnia. The area and information highlighted is relevant to this particular investigation. I have highlighted the gut on the diagram because that is where many of the enzymes in the Daphnia are. Enzymes as in all other living organisms control a Daphnia's metabolic rate. I will keep this in mind when investigating the heart rate. Enzymes are biological...

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