Question

The components of a reflex arc are

• A. Sensory neuron, receptor, motor neuron
• B. Receptor, sensory neuron, center, motor neuron
• C. Receptor, sensory neuron, center, motor neuron, effector organ
• D. Motor neuron, sensory neuron, center, effector organ

Answer 1

The correct option is C Receptor, sensory neuron, center, motor neuron, effector organ

A reflex arc is a simple nervous pathway and consists of the sensory/afferent neuron, center (spinal cord), motor/efferent neuron and effector organ. The afferent/sensory neurons transmit the sensory information from sensory receptors to the spinal cord (sensory pathway). 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.

Therefore, the correct answer is option C.