Question

Reflex arc is formed by
A) Receptor - brain - muscles
B) Muscles - spinal cord - receptor
C) Receptor - spinal cord - muscles
D) Muscle - brain - receptor

Answer 1

Hint:The reflex arc is a sensitive pathway and consists of the neural receptor, afferent neuron, core, efferent neuron and an effector medium. The afferent/sensory neurons carry the sensory data from sensory receptors to the spinal cord.

Complete answer:
Before we find out the correct option let us know a little about reflex arcs. A reflex arc is a neural pathway that regulates a reflex. In vertebrates, most sensitive neurons do not pass straight into the brain, but synapse in the spinal cord. This provides for more active reflex reactions to happen by stimulating spinal motor neurons without the suspension of routing signs through the brain.

The reflex arc begins with sensory receptors, not with tissues. The interneurons of the spinal cord combine the incoming data and signal is similar to motor/efferent neurons. The motor pathway carries the sign from motor neurons to the effector parts (glands and muscles etc). Thus, the reflex arc gives the data from receptor to effector through the spinal cord. The brain is not part of the involuntary arc. Therefore, this is the correct answer.

Hence the correct answer is option C.

Note:A reflex is an involuntary and nearly immediate action in response to a motive. The reflex is the involuntary response to a motive that does not bear or need intelligent thought as it happens within a reflex arc. Reflex arcs act on an impulse before that stimulus enters the brain.