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During repolarisation, the neural membrane is
(A) Permeable for K+ ions for their efflux
(B) Impermeable for K+ ions
(C) Permeable for Na+ for their influx
(D) Impermeable for both Na+ and K+ ions
From above, select the option with only incorrect statement
- a)(A), (B) and (C)
- b)(b), (C) and (D)
- c)(A), (C) and(D)
- d)All of these
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
During repolarisation, the neural membrane is(A) Permeable for K+ ion...
Explanation:
During repolarisation, the neural membrane returns to its resting potential after depolarisation. This involves the movement of ions across the membrane, which can be either permeable or impermeable depending on the state of the channels. The correct statement regarding the movement of ions during repolarisation is:
- Permeable for K+ ions for their efflux
This means that during repolarisation, the membrane becomes more permeable to potassium ions, allowing them to move out of the cell. This is due to the opening of voltage-gated potassium channels and the closing of voltage-gated sodium channels. The movement of potassium ions out of the cell results in a more negative membrane potential, returning it to its resting state.
The incorrect statements regarding the movement of ions during repolarisation are:
- Impermeable for K+ ions
- Permeable for Na+ for their influx
- Impermeable for both Na+ and K+ ions
These statements are incorrect because:
- The neural membrane is permeable for K+ ions during repolarisation, not impermeable.
- The neural membrane is not permeable for Na+ ions during repolarisation, as the voltage-gated sodium channels are closed.
- If the membrane was impermeable for both Na+ and K+ ions during repolarisation, there would be no movement of ions across the membrane, and the membrane potential would not return to its resting state.
Therefore, the correct option is (B), which includes only the incorrect statements (b), (C), and (D).
During repolarisation, the neural membrane returns to its resting potential after depolarisation. This involves the movement of ions across the membrane, which can be either permeable or impermeable depending on the state of the channels. The correct statement regarding the movement of ions during repolarisation is:
- Permeable for K+ ions for their efflux
This means that during repolarisation, the membrane becomes more permeable to potassium ions, allowing them to move out of the cell. This is due to the opening of voltage-gated potassium channels and the closing of voltage-gated sodium channels. The movement of potassium ions out of the cell results in a more negative membrane potential, returning it to its resting state.
The incorrect statements regarding the movement of ions during repolarisation are:
- Impermeable for K+ ions
- Permeable for Na+ for their influx
- Impermeable for both Na+ and K+ ions
These statements are incorrect because:
- The neural membrane is permeable for K+ ions during repolarisation, not impermeable.
- The neural membrane is not permeable for Na+ ions during repolarisation, as the voltage-gated sodium channels are closed.
- If the membrane was impermeable for both Na+ and K+ ions during repolarisation, there would be no movement of ions across the membrane, and the membrane potential would not return to its resting state.
Therefore, the correct option is (B), which includes only the incorrect statements (b), (C), and (D).
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Community Answer
During repolarisation, the neural membrane is(A) Permeable for K+ ion...
During depolarisation, the Na+ enters into axoplasm.
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During repolarisation, the neural membrane is(A) Permeable for K+ ions for their efflux(B) Impermeable for K+ ions(C) Permeable for Na+ for their influx(D) Impermeable for both Na+ and K+ ionsFrom above, select the option with only incorrect statementa)(A), (B) and (C)b)(b), (C) and (D)c)(A), (C) and(D)d)All of theseCorrect answer is option 'B'. Can you explain this answer?
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