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

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Solution:
(a) Sensory neuron- It receives the signals (heat) from the stimulus (hot pan) and carries it directly to the spinal cord.
(b) Spinal cord (CNS)- It is a cylindrical structure that carries bundles of nerve fibres. It receives the signal from the sensory neurons and processes and sends them back through the motor neurons.
(c) Motor neuron- It transmits the signals to the effector muscle (muscle in arm) so that the muscle can take action immediately.
(d) Effector (Muscle in arm)- They act in response to the stimuli and shows contraction.

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