Question

multiple choice question
when the receptor cells have registered a ______, the energy is converted to an electrochemical impulse.

○ sensation
○ perception
○ stimulus
○ threshold

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Explanation:

1. Analyze "sensation": Sensation is the process of detecting sensory information, not what receptor cells register to start conversion. Eliminate.
2. Analyze "perception": Perception is interpreting sensations, not the input for energy conversion. Eliminate.
3. Analyze "stimulus": A stimulus is an external input (e.g., light, sound) that receptor cells detect. Detecting a stimulus triggers energy conversion to an electrochemical impulse. This fits.
4. Analyze "threshold": Threshold is the minimum stimulus intensity to be detected, not the thing registered for conversion. Eliminate.

Answer:

C. stimulus