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Investigating the effect of chemicals on the rate of heart beat of Daphnia Planning Aim The aim of the experiment is to look into the effects of the chemicals: ethanol and adrenaline and on the rate of heartbeat of the water flea, Daphnia. Background Information Daphnia: A small poikilothermic (body temperature affected by temperature of environment) fresh water crustacean. It is relatively transparent so its internal organs can be observed though a light microscope, therefore the heartbeat can be seen. The heart and nerves involved with it: Heartbeats are controlled mainly by nerve pulses. These impulses are caused by pacemaker neurons situated in a group of nerve cells called the cardiac ganglion. The impulses are then transmitted to larger follower neurons, which carry the signal to the cardiac muscle, causing it to beat. Receptors permit communication between neighbouring nerve cells, e.g. between the pacemaker neurons and the follower neurons, the receptors attach to a chemical called a...

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