Q22 of 54 Page 49

For minor surgeries in the body, doctors administer local anaesthesia to a part of the body so that the pain will not be felt by the patient. At which part, do you think, the nerve impulse is being arrested due to the effect of anaesthesia?

Because synapse is the site from where the transmission of the impulse takes place. When the impulse of transmission is arrested the signal does not reach the brain and we do not feel any pain and sensation. Therefore anesthesia acts on synapses.

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20

Blinking when a beam of light is suddenly focussed on the eyes and sudden withdrawal of hand upon touching a hot body are some of the examples of reflex actions. Which part of the central nervous system acts as the centre these actions?

 21

The following are the parts of a neuron:

a) Axon b) Terminal branches


c) Cyton d) Dendrites


The correct pathway of a nerve impulse through these parts is _____________.

 23

Assertion (A): All spinal nerves are mixed nerves.

Reason (R): Each spinal nerve has a sensory root and a motor root.

 1

Name the two systems which help in the control and co-ordination of metabolic activities.

Write any one difference between them.