Question

In spite of the presence of complex neuron networks, reflex arcs continue to be more efficient for quick responses.
A. True
B. False

Answer 1

Neurons generally communicate by an electrochemical process. All neuron dendrites contain receptors for neurotransmitters released by nearby neurons. If the signal received by the receptors is strong then an action potential will travel down through the axon to the terminal and result in the release of neurotransmitters into the synapse. Reflex action or reflex arc is involuntary and is involved in the instant movement in response to a stimulus.

Complete answer: The reflex is an automatic response to a stimulus which does not receive or need conscious thought. This reflex immediately acts in response to an impulse before that impulse reaches the brain.
Some of the basic examples of reflex arc are biceps reflex, triceps reflex and ankle jerk reflex.
The origin of the reflex arc is the spinal cord which helps the brain to record any event and use it in future. In the case of any reflex action, the information has to reach the brain within seconds but the problem is the brain cannot act that fast therefore part of this action is completed by the spinal cord although the brain will receive a sensory input when a reflex action occurs.
Therefore the reflex arc continues to be the most efficient and quick way of response.
So, the statement is true.

Note: Usually reflex arcs are divided into two - Automatic reflex arc which affects the internal organs and the somatic reflex arc which affects the muscles only.
Most of the reflexes involve only three neurons - sensory neuron, relay neuron and motor neuron.