GENERAL HISTOLOGY

Detailed explanation-1: -Motor neuron sends electrical impulses to an effector. Effector produces a response (muscle contracts to move hand away).

Detailed explanation-2: -The primary components of the reflex arc are the sensory neurons (or receptors) that receive stimulation and in turn connect to other nerve cells that activate muscle cells (or effectors), which perform the reflex action.

Detailed explanation-3: -An effector organ is one that acts in response to the stimulus. In the case of the reflex arc, the effector organ is almost always a muscle fibre or a group of muscle fibres. It is innervated by a motor neuron carrying information about the response. In most cases, three neurons are involved in a reflex arc.

Detailed explanation-4: -The relay neuron synapses with a motor neuron, which leaves the spinal cord via the ventral root. The motor neuron synapses with a muscle (effector), causing it to contract and remove the limb from the pain stimulus.