Question

which is the correct order for transmission of a nerve impulse from a receptor to an effector?
sensory receptor→sensory neuron→interneuron→motor neuron→muscle cell
sensory receptor→sensory neuron→motor neuron→interneuron→muscle cell
sensory receptor→motor neuron→interneuron→sensory neuron→muscle cell
sensory receptor→interneuron→motor neuron→sensory neuron→muscle cell

Explanation:

• A sensory receptor detects a stimulus.
• It sends a signal to a sensory neuron.
• The sensory neuron transmits the signal to an interneuron (in the central nervous system).
• The interneuron then sends the signal to a motor neuron.
• The motor neuron finally transmits the signal to a muscle cell (effector).

Answer:

Sensory receptor→Sensory neuron→Interneuron→Motor neuron→Muscle cell