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  •  In a resting nerve fibre, the concentration of   ions is<div class=

 In a resting nerve fibre, the concentration of K^{+}  ions is

Option: 1

More in the ECF than axoplasm


Option: 2

More in the axoplasm than ECF


Option: 3

Equal in ECF and axoplasm


Option: 4

None of the above


Answers (1)

best_answer
 

As we have learnt in 

Resting Potential (Polarization):

  • When an axon is resting, its membrane is polarized; that is, the outside (ECF) is positive compared to the inside (axoplasm), which is negative.
  • This occurs due to a protein carrier in the membrane, called the sodium-potassium pump, which pumps three sodium (Na+) out of the axon and two potassium (K+) into the axon.
  • Another factor that causes the inside of the axon to be negative compared to the outside is the presence of large, negatively charged protein ions inside an axon.
  • The polarity across an axon that is not conducting nerve impulses is called the resting potential (-70mV).
  • Such an axolemma is said to be polarised.

Therefore, In a resting fibre, the concentration of K^{+} ions is more in the axoplasm than ECF because of the presence of a protein carrier in the membrane, called the sodium-potassium pump, which pumps three sodium (Na^{+}) out of the axon and two potassium (K^{+})  into the axon. Hence, the correct answer is option b.

Posted by

Kuldeep Maurya

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