Explain the advantage of the withdrawal reflex when a finger touches a hot object.

Here are the solutions to question 4:

4. Neurones are cells specialized to transmit nerve impulses.
Fig. 4.1 shows a neurone.

a) This neurone is part of the reflex arc which is responsible for the withdrawal reflex when a finger touches a hot object.

i) Draw a circle on Fig. 4.1 to show the part of the neurone where the impulse is transferred to the effector.

The impulse is transferred to the effector at the axon terminal. You should draw a circle around the region labeled axon terminal in Fig. 4.1.

ii) Explain the advantage of the withdrawal reflex when a finger touches a hot object.

The advantage of the withdrawal reflex is that it prevents damage/injury to tissues by minimizing the time the finger is in contact with the hot object, thereby reducing the risk of burns. This is an involuntary and rapid response that protects the body from harm.