In reflex action, reflex arch is formed by

The correct answer is Receptor → Spinal cord → Muscle.

Key Points

• In the reflex action, the reflex arch is formed by Receptor → Spinal cord → Muscle.
• The correct circuit of the reflex arc is Receptor→sensory neuron→spinal cord→motor neuron→effector
• A reflex arc is a neural pathway that controls a reflex action. In vertebrates, instead of passing directly to the brain, the sensory neuron's synapse in the spinal cord.
• This helps in a faster reflex action without the delay that is caused by routing signals through the brain.
• The three main types of neurons are sensory, motor and relay neurons.

Important Points

The detailed process is

• The receptor detects a stimulus.
• Sensory neurons send electrical impulses to a relay neuron located in the spinal cord.
• Relay neurons connect sensory neurons to motor neurons.
• Motor neurons send an electrical impulse to an effector.
• Effector produces a response.