Question

Sequence of events which occur in a reflex action are

• A. Receptor - Motor neuron - CNS - Sensory neuron - Effector muscle
• B. Effector muscle - CNS - Sensory nerve - Sensory organ
• C. CNS - Sensory neuron - Motor neuron - Effector muscle
• D. Receptor organ - Sensory neuron - CNS - Motor neuron - Effector muscle

Answer 1

The correct option is D Receptor organ - Sensory neuron - CNS - Motor neuron - Effector 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 CNS 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, the correct answer is option D.