PhysiologyOfNervousSystem_MCQ-BasicLevel

Physiology Of Nervous System - Basic

Dear Readers,

The nervous system is made up of the central nervous system and the peripheral nervous system. The central nervous system (CNS) is made up of the brain and spinal cord. The brain controls most body functions, including awareness, movements, sensations, thoughts, speech and memory.

Q1. The rate of conduction of impulses in motion nerve of a mammal is

•  4 m/sec
•  10 m/sec
•  50 m/sec
•  100 m/sec

100 m/sec

Q2. Resting potential of the membrane is

•   – 60 to – 70 mV
•   – 100 to – 10 mV
•   50 to 100 mV
•   – 20 to – 30 mV

– 60 to – 70 mV

Q3. When an impulse passes, the membrane is depolarized and the charge of the cells is

•  Outside positive and inside negative
•  Inside positive and outside negative
•  Both sides have zero potential
•  Both sides are electronegative

Inside positive and outside negative

Q4. The potential difference in the membrane which is responsible for the conduction of an impulse is brought about by a change in the membrane

•  Permeability
•  Structure
•  Anions
•  Concentration

Permeability

Q5. Conduction of an impulse along the axon is associated with the

•  Resting potential
•  Cl – concentration
•  Strength of an impulse
•  Action potential

Action potential

Q6. In a resting nerve there is a mechanism known as sodium pump which results in

•  Na⁺ being pumped out
•  Na⁺ being pumped in
•  Exchange of Na⁺ and K⁺
•  Na⁺ being pumped into the cell

Exchange of Na⁺ and K⁺

Q7. During the transmission of nerve impulse, which of the following takes place

•  Flux of Na⁺ inwards and K⁺ outwards
•  Flux of K⁺ inwards and Na⁺ outwards
•  Flux of K⁺ inwards and Na⁺ inwards
•  Flux of K⁺ outwards and Na⁺ outwards

Flux of Na⁺ inwards and K⁺ outwards

Q8. Na⁺ concentration is about 10X higher ‘outside’ the cell then inside when the neuron is in

•  Resting phase
•  A state of constant impulse transmission
•  Refractory phase immediately after transmitting nerve impulse
•  Polarised state

Polarised state

Q9. Transport of Na⁺ and K⁺ across the neuronal membrane after depolarisation to restore potential difference is facilitated by

•  Passive diffusion
•  ATP directed Na⁺ and K⁺ pump
•  Facilitated diffusion
•  Osmosis

ATP directed Na⁺ and K⁺ pump

Q10. Identify the correct statement

•  The period during which a nerve does not respond to stimuli is called critical period
•   Electrogenesis in nerve cells is due to influx of K⁺
•  The permeability of Na⁺ increases during depolarisation
•  Na⁺ acts is a chelator

The permeability of Na⁺ increases during depolarisation