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Which of the following statements are correct?
(A) Depolarization of an axonal membrane is caused due to rise in stimulus-induced permeability to Na⁺ and its rapid influx into axoplasm.
(B) Diffusion of K⁺ outside the axonal membrane restores the resting potential of the membrane.
(C) Sodium-potassium pump maintains active transport of 2 Na⁺ outwards for 3 K⁺ into the axoplasm across the resting membrane.
(A) Depolarization of an axonal membrane is caused due to rise in stimulus-induced permeability to Na⁺ and its rapid influx into axoplasm.
(B) Diffusion of K⁺ outside the axonal membrane restores the resting potential of the membrane.
(C) Sodium-potassium pump maintains active transport of 2 Na⁺ outwards for 3 K⁺ into the axoplasm across the resting membrane.
- a)A only
- b)A and B
- c)B and C
- d)A and C
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Which of the following statements are correct?(A) Depolarization of an...
Depolarization of the axonal membrane happens due to an increase in Na⁺ permeability, which allows Na⁺ ions to rapidly enter the axoplasm, making Statement A correct. Statement B is also correct, as the diffusion of K⁺ out of the membrane restores the resting potential. Statement C is incorrect because the sodium-potassium pump moves 3 Na⁺ out for every 2 K⁺ in, not the other way around. Hence, the correct statements are A and B.Topic in NCERT: Generation and Conduction of Nerve Impulse
Line in NCERT: "The rise in the stimulus-induced permeability to Na* is extremely short-lived. It is quickly followed by a rise in permeability to K*. Within a fraction of a second, K+ diffuses outside the membrane and restores the resting potential of the membrane at the site of excitation and the fibre becomes once more responsive to further stimulation."
Most Upvoted Answer
Which of the following statements are correct?(A) Depolarization of an...
Understanding the Statements
Let's analyze each statement to determine their correctness:
Statement A: Depolarization Mechanism
- Correctness: This statement is true.
- Explanation: During depolarization, the axonal membrane's permeability to Na⁺ increases due to the opening of voltage-gated sodium channels. This leads to a rapid influx of Na⁺ ions into the axoplasm, causing the membrane potential to become less negative.
Statement B: Restoration of Resting Potential
- Correctness: This statement is also true.
- Explanation: After depolarization, K⁺ channels open, allowing K⁺ ions to diffuse out of the axon. This efflux of K⁺ ions helps restore the resting membrane potential, moving it back towards a more negative value.
Statement C: Sodium-Potassium Pump Function
- Correctness: This statement is false.
- Explanation: The sodium-potassium pump actually transports 3 Na⁺ ions out of the cell and brings in 2 K⁺ ions. This active transport is essential for maintaining the resting membrane potential but is described incorrectly in this statement.
Conclusion
Given the analysis above, the correct answer is B, as both statements A and B are accurate, while C contains an error regarding the transport ratio of the sodium-potassium pump. Thus, the most accurate choice is that only statements A and B are correct, making option B the right answer.
Let's analyze each statement to determine their correctness:
Statement A: Depolarization Mechanism
- Correctness: This statement is true.
- Explanation: During depolarization, the axonal membrane's permeability to Na⁺ increases due to the opening of voltage-gated sodium channels. This leads to a rapid influx of Na⁺ ions into the axoplasm, causing the membrane potential to become less negative.
Statement B: Restoration of Resting Potential
- Correctness: This statement is also true.
- Explanation: After depolarization, K⁺ channels open, allowing K⁺ ions to diffuse out of the axon. This efflux of K⁺ ions helps restore the resting membrane potential, moving it back towards a more negative value.
Statement C: Sodium-Potassium Pump Function
- Correctness: This statement is false.
- Explanation: The sodium-potassium pump actually transports 3 Na⁺ ions out of the cell and brings in 2 K⁺ ions. This active transport is essential for maintaining the resting membrane potential but is described incorrectly in this statement.
Conclusion
Given the analysis above, the correct answer is B, as both statements A and B are accurate, while C contains an error regarding the transport ratio of the sodium-potassium pump. Thus, the most accurate choice is that only statements A and B are correct, making option B the right answer.
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Which of the following statements are correct?(A) Depolarization of an axonal membrane is caused due to rise in stimulus-induced permeability to Na⁺ and its rapid influx into axoplasm.(B) Diffusion of K⁺ outside the axonal membrane restores the resting potential of the membrane.(C) Sodium-potassium pump maintains active transport of 2 Na⁺ outwards for 3 K⁺ into the axoplasm across the resting membrane.a)A onlyb)A and Bc)B and Cd)A and CCorrect answer is option 'B'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the following statements are correct?(A) Depolarization of an axonal membrane is caused due to rise in stimulus-induced permeability to Na⁺ and its rapid influx into axoplasm.(B) Diffusion of K⁺ outside the axonal membrane restores the resting potential of the membrane.(C) Sodium-potassium pump maintains active transport of 2 Na⁺ outwards for 3 K⁺ into the axoplasm across the resting membrane.a)A onlyb)A and Bc)B and Cd)A and CCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements are correct?(A) Depolarization of an axonal membrane is caused due to rise in stimulus-induced permeability to Na⁺ and its rapid influx into axoplasm.(B) Diffusion of K⁺ outside the axonal membrane restores the resting potential of the membrane.(C) Sodium-potassium pump maintains active transport of 2 Na⁺ outwards for 3 K⁺ into the axoplasm across the resting membrane.a)A onlyb)A and Bc)B and Cd)A and CCorrect answer is option 'B'. Can you explain this answer?.
Which of the following statements are correct?(A) Depolarization of an axonal membrane is caused due to rise in stimulus-induced permeability to Na⁺ and its rapid influx into axoplasm.(B) Diffusion of K⁺ outside the axonal membrane restores the resting potential of the membrane.(C) Sodium-potassium pump maintains active transport of 2 Na⁺ outwards for 3 K⁺ into the axoplasm across the resting membrane.a)A onlyb)A and Bc)B and Cd)A and CCorrect answer is option 'B'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Which of the following statements are correct?(A) Depolarization of an axonal membrane is caused due to rise in stimulus-induced permeability to Na⁺ and its rapid influx into axoplasm.(B) Diffusion of K⁺ outside the axonal membrane restores the resting potential of the membrane.(C) Sodium-potassium pump maintains active transport of 2 Na⁺ outwards for 3 K⁺ into the axoplasm across the resting membrane.a)A onlyb)A and Bc)B and Cd)A and CCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements are correct?(A) Depolarization of an axonal membrane is caused due to rise in stimulus-induced permeability to Na⁺ and its rapid influx into axoplasm.(B) Diffusion of K⁺ outside the axonal membrane restores the resting potential of the membrane.(C) Sodium-potassium pump maintains active transport of 2 Na⁺ outwards for 3 K⁺ into the axoplasm across the resting membrane.a)A onlyb)A and Bc)B and Cd)A and CCorrect answer is option 'B'. Can you explain this answer?.
Solutions for Which of the following statements are correct?(A) Depolarization of an axonal membrane is caused due to rise in stimulus-induced permeability to Na⁺ and its rapid influx into axoplasm.(B) Diffusion of K⁺ outside the axonal membrane restores the resting potential of the membrane.(C) Sodium-potassium pump maintains active transport of 2 Na⁺ outwards for 3 K⁺ into the axoplasm across the resting membrane.a)A onlyb)A and Bc)B and Cd)A and CCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for NEET.
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Which of the following statements are correct?(A) Depolarization of an axonal membrane is caused due to rise in stimulus-induced permeability to Na⁺ and its rapid influx into axoplasm.(B) Diffusion of K⁺ outside the axonal membrane restores the resting potential of the membrane.(C) Sodium-potassium pump maintains active transport of 2 Na⁺ outwards for 3 K⁺ into the axoplasm across the resting membrane.a)A onlyb)A and Bc)B and Cd)A and CCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for Which of the following statements are correct?(A) Depolarization of an axonal membrane is caused due to rise in stimulus-induced permeability to Na⁺ and its rapid influx into axoplasm.(B) Diffusion of K⁺ outside the axonal membrane restores the resting potential of the membrane.(C) Sodium-potassium pump maintains active transport of 2 Na⁺ outwards for 3 K⁺ into the axoplasm across the resting membrane.a)A onlyb)A and Bc)B and Cd)A and CCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of Which of the following statements are correct?(A) Depolarization of an axonal membrane is caused due to rise in stimulus-induced permeability to Na⁺ and its rapid influx into axoplasm.(B) Diffusion of K⁺ outside the axonal membrane restores the resting potential of the membrane.(C) Sodium-potassium pump maintains active transport of 2 Na⁺ outwards for 3 K⁺ into the axoplasm across the resting membrane.a)A onlyb)A and Bc)B and Cd)A and CCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
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