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

Reason (R): Each spinal nerve has a sensory root and a motor root.
A. Both ‘A’ and ‘R’ are true and ‘R’ explains ‘A’.

B. Both ‘A’ and ‘R’ are true but ‘R’ doesn’t explain ‘A’.

C. Only ‘A’ is true but ‘R’ is false.

D. ‘A’ is false but ‘R’ is true.

Spinal nerves are _________________.

Observe the following diagrams that depict the transmission of nerve impulses through two pathways from body parts to CNS:

If all the nerves at both the places are similar in thickness and structure, through which pathway will the transmission of an impulse (of the same threshold) be faster and why?

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

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

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 _____________.

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?

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?

Neurotransmitters are released at the synapse by _________________.