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Stimulus ( plural:stimuli) is that external factor which causes the generation of an impulse by the receptor in the body of an organism.
Receptor is that part of an organism which receives the stimulus and generates an impulse in the body of an organism.
For example, when you touch a hot vessel with your finger, in this case, your finger (or more precisely, the specific cells present in your finger) acts as a receptor, which receives the stimulus and generates the impulse. While,the heat transferred from the vessel acts as the stimulus.
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