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