34. Label the parts (a), (b), (c) and (d) and show the direction of flow of electrical signals in Figure 7.2.

Solution –

1. Sensory neuron
2. Spinal cord
3. Motor neuron
4. Muscle

Flow of electrical signals: Receptors in hand ==> Sensory neurons ==. Spinal cord (CNS) ==>Motor neurons ==> Effector – muscles in arm