Question

1. explain how a reflex arc works using the example of touching something hot.

Explanation:

When you touch something hot, sensory receptors in the skin detect the heat and send a nerve impulse along a sensory neuron to the spinal cord. In the spinal cord, the impulse is passed to a relay neuron, which then sends it to a motor neuron. The motor neuron carries the impulse to a muscle, causing it to contract and pull your hand away from the hot object. This is a rapid, involuntary response that bypasses the brain to provide quick protection.

Answer:

When touching something hot, sensory receptors detect heat and send impulse via sensory neuron to spinal cord. Relay neuron in spinal - cord passes it to motor neuron which causes muscle contraction to pull hand away.