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  • In the resting state , the axonal membrane is (A)_____ with more (B)______ charged ions outside than inside . This unequal distribution of ions is due to (1) the selective permeability of the membr

In the resting state , the axonal membrane is (A)_____ with more (B)______ charged ions outside than inside . This unequal distribution of ions is due to (1) the selective permeability of the membrane , which forms an almost impenetrable barrier to (C)____ and (2) the action of the (D)____ , which pumps (E)_____ Na+ out of the neuron for every (F)_____ K+ brought in.

Select the option that correctly fills the blanks in the paragraph 

Option: 1

A. Depolarised 

B. Positively

C. Na+

D. Sodium-potassium pump 

E. three 

F. two 


Option: 2

A. depolarised 

B. negatively 

C. Na+

D. sodium-potassium pump 

E. three 

F. Two 


Option: 3

A. polarised 

B. negatively 

C. Na+

D. sodium-potassium pump 

E. three 

F. Two 


Option: 4

A. polarised 

B. positively 

C. Na+

D. sodium-potassium pump 

E. three 

F. Two 


Answers (1)

best_answer

 

 

As we have learnt in

Nerve Impulse

  • All the nerve fibres carry information in the form of the nerve impulse.
  • The nerve impulse is the sum total of physical and chemical disturbances created by a stimulus (electrical, chemical or mechanical) in a neuron or nerve fibre which results in the movement of a wave along the nerve fibre.
  • The nerve fibre or axon is like a cylinder. 
  • The interior of the axon is filled with axoplasm (i.e., the cytoplasm of the nerve cell) 
  • The exterior of the axon is covered with a thin membrane, the axon membrane or axolemma.
  • Axolemma is selectively permeable for eimple organic and inorganic molecules 
  • The axon is immersed in the extracellular fluid (ECF).
  • Through axolemma movement of solute takes place between the axoplasm and ECF.
  • Generally, the solutes in ECF and axoplasm are in ionic form.

 

-

 

Therefore,

In the resting state, the axonal membrane is polarised with more positively charged ions outside than inside, unequal distribution of ions is due to the selective permeability of the membrane, which forms impermeable barrier to sodium ion and the action of the sodium-potassium pumps which pumps three sodium ions out of the neuron for every two potassium ions brought in. 

Posted by

Suraj Bhandari

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