Tag: nervous system of man

Questions Related to nervous system of man

The main function of cerebrospinal fluid is

bio-chemistry nervous system of man introduction to brain body fluid central nervous system

  1. Nourishment of brain and spinal cord

  2. Functioning as cushion against shocks

  3. Keeping the central nervous system moist

  4. All of the above

Show answer
Correct Option: D
Explanation:

The cavities of the central nervous system are called the ventricles that are lined with the choroid plexus. The choroid plexus is made up of the inserted piamater, blood vessels, the ependymal cells. It is responsible for the formation of the formation of the extracellular fluid called the cerebrospinal fluid which drains the ventricles of the brain and spinal cord. The CSF is responsible for collecting the waste from the interstitial space, distribution of nutrients to the brain and spinal cord, act as shock collector during injuries and moistening of the central nervous system.

Hence, the correct answer is 'All of the above'

The function of choroid plexus is

bio-chemistry nervous system of man introduction to brain body fluid central nervous system

  1. To produce lymph

  2. To produce blood

  3. To produce cerebrospinal fluid

  4. To produce endolymph

Show answer
Correct Option: C
Explanation:

The choroid plexus is made up of the piamater that is merged into the ventricles, blood capillaries and the ependymal cells that are epithelial cells. The ventricles of the brain contain the choroid plexus. Its function is to produce the cerebrospinal fluid (CSF). The CSF flows from the ventricles into the subarachnoid space through the Foramen of Magendie and Foramen of Luschka. Here it is absorbed by the arachnoid villi and secreted into the cranial venous sinus. From the cranial venous sinus, the CSF enters the blood circulation.

Hence, the correct answer is 'To produce cerebrospinal fluid'

Fluid present in and around the central nervous system is

bio-chemistry nervous system of man introduction to brain body fluid central nervous system

  1. Cerebral fluid

  2. Cerebrospinal fluid

  3. Spinal fluid

  4. Tissue fluid

Show answer
Correct Option: B
Explanation:

The central nervous system consists of the brain and the spinal cord. The cavities of the central nervous system are called the ventricles that are lined with the choroid plexus. The choroid plexus is made up of the inserted piamater, blood vessels, the ependymal cells. It is responsible for the formation of the formation of the extracellular fluid called the cerebrospinal fluid which drains the ventricles of the brain and spinal cord. The CSF returns to blood via the arachnoid villi.

Hence, the correct answer is 'Cerebrospinal fluid'

Which of the following can be regarded functions of the cerebral spinal fluid?

bio-chemistry nervous system of man introduction to brain body fluid central nervous system

  1. Protection

  2. Circulation

  3. Nerve transmission

  4. Both (a) and (b)

Show answer
Correct Option: D
Explanation:

  • CSF protects the brain and spinal cord from trauma.
  • CSF supplies nutrients to nervous system tissue.
  • CSF removes waste products from cerebral metabolism.
So, the correct option is 'Both (a) and (b)'.

Which one does not involve brain ?

biology nervous system of man reflex action innate and learned behaviour coordination in human beings- chemical control

  1. Spinal reflex

  2. Cerebral reflex

  3. Cranial reflex

  4. Voluntary action

Show answer
Correct Option: A
Explanation:

Reflex is an involuntary and instantaneous action in response to a stimulus.

  1. A spinal reflex is a reflex action is controlled by spinal cord and related sensory afferent and an efferent muscle without the influence of brain like we remove our hand when we touch hot object.
  2. Cerebral reflex is an involuntary controlled action that involves brain like a closing of eyes in an exposure of light.
  3. Cranial nerve is mediated by the pathway that includes cranial nerves and brain includes the peripheral and central nervous system.
  4. Voluntary actions are those which depends on our will like eating, bathing etc. and controlled by the cerebellum.
The correct option is "Spinal reflex".

Which biologist first noticed that the muscles of disected frog legs twitched wildly when a spark from an electric machine struck them?

biology nervous system of man reflex action innate and learned behaviour coordination in human beings- chemical control

  1. Georges Cuvier

  2. Franz Joseph Gall

  3. Kaspar Friedrich Wolf

  4. Luigi Galvani

Show answer
Correct Option: D
Explanation:

Luigi Galvani was an Italian physician who demonstrated what we now understand to be the electrical basis of nerve impulses when he made frog muscles twitch by jolting them with a spark from an electrostatic machine. So, the correct option is "D" (Luigi Galvani).

Which of the following are cerebral reflexes?


(i) a person pulls away his hand on touching a hot object.
(ii) a person spits out immediately when a fly enters his mouth while talking.
(iii) a person walking barefoot lifts his foot at once on stepping on to a nail.
(iv) a person's pupil contracts at once in the presence of bright light.

biology nervous system of man reflex action innate and learned behaviour coordination in human beings- chemical control

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (iii) and (iv)

  4. (ii) and (iv)

Show answer
Correct Option: D

Which of the following is not a reflex action?

biology nervous system of man reflex action innate and learned behaviour coordination in human beings- chemical control

  1. Salivation

  2. Sweating

  3. Withdrawal of hand when pinched by needle

  4. Blinking of eyes

Show answer
Correct Option: B
Explanation:

Reflex action is induced by the motor nerves. It is an involuntary and instant movement in response to a stimulus. A reflex action is done by neural pathway of reflex arc. In this, the action is done before the impulse reaches the brain. Out of the given options, sweating is not a reflex action. Salivation is a reflex action in which smell of food activate neural pathway and activates muscles and glands. This releases salivary juices. When someone is pinched by a needle, it activates neural pathway to evoke a response. The skin receptors quickly send nerve impulses to the spinal cord and response is relayed back. Apart from these, coughing, sneezing and blinking of eyes are also reflex actions.

Thus, the correct answer is 'Sweating.'

The kneejerk reflex in response to a mallet tap over the patellar ligament

biology nervous system of man reflex action innate and learned behaviour coordination in human beings- chemical control

  1. is a conditioned reflex

  2. is a monosynaptic reflex

  3. has its reflex centre in the spinal cord

  4. is mediated by a three neuron reflex are

Show answer
Correct Option: B
Explanation:

Monosynaptic Reflex is a simple reflex that involves the transmission of an impulse from a sensory neuron to a motor neuron across a single synapse in the spinal cord. The knee-jerk reflex action is an example of such type of reflex.

So, the correct option is 'is a monosynaptic reflex'.

What is the advantage of reflex action ?

biology nervous system of man reflex action innate and learned behaviour coordination in human beings- chemical control

  1. It has to be learned

  2. It happens differently each time

  3. It does not have to be learned

  4. None of them

Show answer
Correct Option: A