GENERAL HISTOLOGY

Detailed explanation-1: -The afferent neuron receives signal from a sensory organ and transmits the impulse via a dorsal nerve root into the CNS (at the level of spinal cord). The efferent nueuron then carries signals from CNS to the effector. The stimulus and response thus forms a reflex arc.

Detailed explanation-2: -Reflex arcs Sensory neuron sends electrical impulses to a relay neuron, which is located in the spinal cord of the CNS. Relay neurons connect sensory neurons to motor neurons. Motor neuron sends electrical impulses to an effector.

Detailed explanation-3: -Answer and Explanation: The component of the reflex arc that carries an action potential from the CNS (central nervous system) to an effector is the motor neuron. The motor neuron carries action potential from the spinal cord (part of the CNS) to the muscle (called the effector).

Detailed explanation-4: -The sensory neuron conducts nerve impulses along an afferent pathway towards the CNS.

Detailed explanation-5: -The simplest arrangement of a reflex arc consists of the receptor, an interneuron (or adjustor), and an effector; together, these units form a functional group. Sensory cells carry input from the receptor (afferent impulses) to a central interneuron, which makes contact with a motor neuron.