Which of the following is the correct sequence of the components in a reflex arc?
1
Muscle → Motor neuron → Receptor →Sensory neuron → Spinal cord
2
Muscle → Sensory neuron →Spinal cord → Motor neuron → Receptor
3
Receptor → Sensory neuron → Spinal cord → Motor neuron → Muscle
4
Receptor →Motor neuron →Spinal cord → Sensory neuron → Muscle