Question

Which one of the following represents the correct of reflex action?

• A. Receptor $\to$ Sensory nerve $\to$ Motor nerve $\to$ Spinal cord $\to$ Muscle
• B. Receptor $\to$ Motor nerve $\to$ Spinal cord $\to$ Sensory nerve $\to$ Muscle
• C. Receptor $\to$ Sensory nerve $\to$ Spinal cord $\to$ Muscle $\to$ Motor nerve
• D. Receptor $\to$ Sensory nerve $\to$ Spinal cord $\to$ Motor nerve $\to$ Muscle

Answer 1

Answer: (D)

Receptor $\to$ Sensory nerve $\to$ Spinal cord $\to$ Motor nerve $\to$ Muscle

A reflex arc is a simple nervous pathway which is responsible for the sudden reaction known as the reflex action. The afferent/sensory neurons are present in the receptor organ which receive the stimulus. The neuron transmits the sensory information from receptor organ to the spinal cord or the brain. The spinal cord integrates 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, the correct answer is option D.