Tag: nervous system of man

Quizzes (14) Questions (241)

Questions Related to nervous system of man

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

The main function of cerebrospinal fluid is

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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'

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

The function of choroid plexus is

  1. To produce lymph

  2. To produce blood

  3. To produce cerebrospinal fluid

  4. To produce endolymph
Reveal answer Fill a bubble to check yourself
C Correct answer
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'

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

Fluid present in and around the central nervous system is

  1. Cerebral fluid

  2. Cerebrospinal fluid

  3. Spinal fluid

  4. Tissue fluid
Reveal answer Fill a bubble to check yourself
B Correct answer
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'

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

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

  1. Protection

  2. Circulation

  3. Nerve transmission

  4. Both (a) and (b)
Reveal answer Fill a bubble to check yourself
D Correct answer
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)'.

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

Which one does not involve brain ?

  1. Spinal reflex

  2. Cerebral reflex

  3. Cranial reflex

  4. Voluntary action
Reveal answer Fill a bubble to check yourself
A Correct answer
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".

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

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

  1. Georges Cuvier

  2. Franz Joseph Gall

  3. Kaspar Friedrich Wolf

  4. Luigi Galvani
Reveal answer Fill a bubble to check yourself
D Correct answer
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).

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

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.

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (iii) and (iv)

  4. (ii) and (iv)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cerebral reflexes involve the brain. Spitting out a fly (ii) and pupil contraction (iv) are controlled by centers in the brainstem (midbrain/medulla), whereas pulling a hand away (i) and lifting a foot (iii) are spinal reflexes.

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

Which of the following is not a reflex action?

  1. Salivation

  2. Sweating

  3. Withdrawal of hand when pinched by needle

  4. Blinking of eyes
Reveal answer Fill a bubble to check yourself
B Correct answer
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.'

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

What is the advantage of reflex action ?

  1. It has to be learned

  2. It happens differently each time

  3. It does not have to be learned

  4. None of them
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Reflex actions are rapid, involuntary, automatic responses to stimuli that are mediated by the spinal cord. Because they are hardwired into the nervous system from birth, they do not need to be learned through experience or training, which provides a crucial survival advantage by ensuring fast reactions.