Reflex Arc Diagram: Explaining the pathway from stimulus to response in the nervous system.

Diagram illustrating the reflex arc process, showing stimulus (heat), receptor in skin, sensory neuron, spinal cord with interneuron, motor neuron, and effector (muscle) response, with brain sensation indicated.

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Show Answer Key & Explanations Step-by-step solution for: Reflex Arc - Definition, Steps, Components, and Diagram

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- The stimulus (heat) activates receptors in the skin.
- Sensory neurons transmit the pain signal to the spinal cord via the dorsal root ganglion.
- In the spinal cord’s grey matter, the sensory neuron synapses with an interneuron.
- The interneuron relays the signal to a motor neuron in the ventral horn.
- The motor neuron sends an impulse through the ventral root to the effector (muscle).
- The muscle contracts, causing the hand to withdraw from the heat source.
- Simultaneously, the interneuron sends a signal to the brain for sensation processing.

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