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

The correct option is C Receptor - spinal cord - muscles

The reflex arc is a simple nervous pathway and consists of the sensory receptor, afferent neuron, centre, efferent neuron and effector organ. The afferent/sensory neurons transmit the sensory information from sensory receptors to the spinal cord (sensory pathway). Reflex arc starts with sensory receptors, not with muscles. The interneurons of spinal cord integrate the incoming information and signal is relayed to motor/efferent neurons. The motor pathway transmits the signal from motor neurons to the effector organs (muscles and glands etc). Thus, reflex arc transmits the information from receptor to effector via the spinal cord which. The brain is not the part of reflex arc. Thus, the correct answer is option C.