Question

Label the parts (a), (b), (c) and (d) and show the direction of flow of electrical signals in the given figure.

 

Answer 1

1. Sensory neuron
2. Spinal cord 
3. Motor neuron
4. Muscle (Effector)

The direction of the flow of electrical signals:
Receptor in hand → Sensory neuron → Spinal cord → Motor neuron → Muscles in arm.