The third event in the sequence of a nerve impulse occurs in the C.N.S (Central Nervous System), specifically in the brain or spinal cord.
Here's a step-by-step explanation:
1. A stimulus initiates the nerve impulse by triggering sensory receptors in the body.
2. The sensory receptors detect the stimulus and generate electrical signals.
3. These electrical signals are then transmitted along sensory neurons to the Central Nervous System (C.N.S).
4. In the C.N.S, the nerve impulse is processed and interpreted.
5. Responses are then formulated based on this processing, and motor neurons carry signals from the C.N.S to effectors (muscles or glands) to produce a response.
Therefore, the third event in the sequence occurs in the C.N.S where the nerve impulse is further processed and analyzed before a response is generated and sent out to the appropriate parts of the body.
