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Nervous System - 4

Description: Nervous System - I
Number of Questions: 20
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Tags: Nervous System - I Neuron Nervous System
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What are the gaps through out the length of the myelin sheath called?

  1. Synaptic clefts

  2. Axons

  3. Dendron

  4. Node of Ranvier

  5. Synapse

Show answer
Correct Option: D
Explanation:

The myelin sheath shows gaps throughout the length, which are called Nodes of Ranvier.

Which of the following prevents the mixing of impulses in the adjacent axons?

  1. Myelin sheath

  2. Acetylcholine

  3. Synaptic cleft

  4. Nissil granules

  5. Neurilemma

Show answer
Correct Option: A
Explanation:

The myelin sheath of the axon acts like an insulation and prevents mixing of impulses in the adjacent axons.

In neurons, axon is surrounded by a white insulating sheath. What is this sheath called?

  1. Myelin sheath

  2. Neurilemma

  3. Node of Ranvier

  4. Cyton

  5. Dendrite

Show answer
Correct Option: B
Explanation:

In most neurons, axon is surrounded by a white insulating sheath covering cells, i.e. neurilemma.

Axon terminals are closely placed near the dendrites of other neurons but are not connected. What are such gaps called?

  1. Node of Ranvier

  2. Excited region

  3. Synaptic clefts

  4. Dendrite

  5. Neurilemma

Show answer
Correct Option: C
Explanation:

The gaps between two axons are called synaptic clefts.

Which of the following statements is not correct?

  1. Optic nerve arising from the eye and ending in the brain is called mixed nerve.

  2. A nerve arising from brain and supplying blood to the muscles of the eyeball for rotating the eye is a motor nerve.

  3. The myelin sheath acts like an insulation.

  4. A wave of irritability is called an impulse.

  5. Acetylcholine sets a new impulse in the dendrites of the adjacent neuron.

Show answer
Correct Option: A
Explanation:

Optic nerve arising from the eye and ending in the brain is a sensory nerve.

What is the sheet of fibres connecting the two cerebral hemispheres called?

  1. Corpus callosum

  2. Meninges

  3. Frontal lobe

  4. Diencephalon

  5. Synaptonemal cleft

Show answer
Correct Option: A
Explanation:

Corpus callosum is a sheet of fibres connecting the two cerebral hemispheres. It transfers information from one hemisphere to another.

What is 'jumping of the action potential' at the Nodes of Ranvier called?

  1. Recovery phase

  2. Active phase

  3. Saltatory conduction

  4. Neurotransmission

Show answer
Correct Option: C
Explanation:

Saltatory conduction is known as the Jumping of the action potential at the Nodes of Ranvier.

Which of the following statements is incorrect about nerve impulse?

  1. In normal condition, the outer side of the nerve fibre carries positive charge.

  2. The condition when outer side of nerve fibre carries normal (+) charge is called depolarized state.

  3. Nerve impulse travels at a maximum speed of about 100 metres per second only.

  4. Repolarization of nerve takes place due to active transport of Na+ ions again to the outside.

  5. Conduction of nerve impulse is a wave of depolarization followed by repolarisation.

Show answer
Correct Option: B
Explanation:

The condition when outer side of nerve fibre carries normal positive charge is called polarized state.

The space between the covering membranes of brain is filled with a watery fluid, which acts like a cushion to protect the brain from shocks. What is this fluid called?

  1. Cerebral fluid

  2. Cerebrospinal fluid

  3. Meningial fluid

  4. Synovial fluid

  5. Acetylcoline

Show answer
Correct Option: B
Explanation:

Cerebrospinal fluid is filled in the space between covering membranes, which protects the brain from shocks.

Which of the following is an example of conditioned reflex?

  1. Withdrawal of hand on touching a hot surface

  2. Sneezing during cold

  3. Withdrawal of hand on pricking a needle

  4. Salivation in dog on seeing bread

  5. Increased heart beat during stress

Show answer
Correct Option: D
Explanation:

Salivation on seeing food is a conditioned reflex in dog.

Suppose the terminal ends of axon are in contact with dendrites of four adjacent neurons, the nerve impulse of the axon will

  1. travel in one of the neurons because the impulse travels from dendrites of one neuron into the axon of another neuron

  2. travel only in one neuron, which is in closest contact and with the same intensity

  3. get distributed in all the four neurons resulting in weak impulse

  4. travel in all the four neurons

  5. travel in only two neurons, which are most closely associated

Show answer
Correct Option: D
Explanation:

The nerve impulse will travel in all the four neurons.

Which of the following is true about association neurons?

  1. They convey the impulse from receptor to the brain.

  2. They carry impulse from the main nervous system to an effector.

  3. They interconnect the sensory and motor neurons.

  4. They conduct depolarization impulse.

  5. They convey the impulse from receptor to an effector.

Show answer
Correct Option: C
Explanation:

Association neurons are located in the brain and spinal cord, which interconnect the sensory and motor neurons.

Anesthesia reduces pain by blocking nerve conduction due to

  1. blockage of neurotransmitter receptors

  2. blockage of Na+ channels

  3. blockage of K+ channels

  4. blockage of blood flow in the target organ

  5. increasing the blood flow in the target part

Show answer
Correct Option: B
Explanation:

Anesthesia reduces pain by blocking nerve conduction due to the blockage of Na+ channels.

What is the pre-excitation potential difference between outside and inside of a nerve called?

  1. Reaction potential

  2. Action potential

  3. Spike potential

  4. Resting potential

  5. Jumping potential

Show answer
Correct Option: D
Explanation:

Resting potential is the pre-excitation potential difference between outside and inside a nerve.

During development of action potential in a nerve fibre, why are the positive and negative charges on outer and inner sides of axon membranes reversed?

  1. Due to movement of K+ ions out of the axon.

  2. As more K+ ions enter the axon than Na+ ions leave the same.

  3. As more Na+ ions enter the axon than K+ ions leave the same.

  4. Due to all Na+ ions entering the axon.

  5. Due to high concentration of Cl- ions.

Show answer
Correct Option: C
Explanation:

Positive and negative charges on outer and inner sides of axon membranes are reversed as more Na+ ions enter the axon than K+ ions leave the same.

Which of the following chemicals sets a new impulse in the dendrites of the adjacent neuron?

  1. Epinephrine

  2. Acetylcholine

  3. Nor-epinephrine

  4. Neurilemma

  5. Adrenaline

Show answer
Correct Option: B
Explanation:

Acetylcholine is a neurotransmitter, which sets a new impulse in the dendrite of the adjacent neuron.

In mammalian eye, the power of accommodation is controlled by changing the shape of the lens. Which of the following governs it?

  1. Cornea

  2. Pupil

  3. Iris

  4. Ciliary body

  5. Lens

Show answer
Correct Option: D
Explanation:

Ciliary body governs the power of accommodation by changing the shape of the lens.

Canal of Schleman is present at the junction of

  1. sensory and non-sensory retina

  2. choroid and ciliary body

  3. sclera and cornea

  4. ciliary body and iris

  5. iris and cornea

Show answer
Correct Option: C
Explanation:

Canal of Schleman is present at the junction of sclera and cornea of eye.

When we move from dark to light, we fail to see for some time but soon the visibility becomes normal. What is this condition called?

  1. Accomodation

  2. Adaptation

  3. Photoperiodism

  4. Mutation

  5. Polarisation

Show answer
Correct Option: B
Explanation:

Ability of eye to adapt itself to see in dark is called adaptation.

A frog with crushed brain is pinched on the leg and the leg is drawn away. It is

  1. automatic motor response

  2. neurotransmitter induced response

  3. conditional reflex

  4. simple reflex

  5. conditional and neurotransmitter induced the response

Show answer
Correct Option: D
Explanation:

A frog with crushed brain is pinched on the leg and the leg is drawn away. It is a simple reflex.

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