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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.

 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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