Question

A mixed nerve is one which
A. carries sensations from 2 or more different sense organs
B. contains both sensory and motor fibres
C. has a common root but branches into two or more nerves to different organs
D. has two or more roots from different parts of the brain

Answer 1

Hint: The information from the organs is transmitted to the brain and there is vice-versa. The control over the reflex actions is controlled by the spinal cord. Different and different neurons make the peripheral system. Brain and spinal cord work in harmony to make the nervous system.

Complete answer:
Our nervous system is composed of the peripheral nervous system (PNS) and central nervous system (CNS). CNS includes the brain and spinal cord. PNS includes a network of spinal and cranial nerves that link to the brain and spinal cord.

The peripheral nervous system has three types of nerves- sensory, motor and mixed.
Sensory nerves are the afferent nerves which carry the sensory information to the CNS. They can recognize the stimuli whether internal or external.
Motor nerves are located in CNS, that send motor signals from CNS to muscles of the body.
Mixed nerves are made of both the sensory and the motor nerves. They can transmit messages in both directions. Cranial nerves are the mixed nerves containing both sensory and motor nerves.

Let us check all the options.
> Option A. - carries sensations from 2 or more different sense organs: the sympathetic division of the autonomic nervous system performs the function of controlling the signals from sense organs.

> Option B. - contains both sensory and motor fibres: mixed nerves are made of both sensory and motor fibres as defined in its definition itself.

> Option C. - has a common root but branches into two or more nerves to different organs: it is a feature of the afferent neurons.

> Option D. - has two or more roots from different parts of the brain : it is a feature of the efferent nerves
So the answer is option B: contains both sensory and motor fibres.

Note: There are billions of neurons in our body. They look different from each other. It forms the inner communication system of our body. The brain interprets the information from the organs and converts them into actions. A neuron is made up of antennae, axon and cell body.