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During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric change? [2007]
- a)First positive, then negative and continue to be positive
- b)First negative, then positive and continue to be positive.
- c)First positive, then negative and again back to positive
- d)First negative, then positive and again back to negative
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
During the transmission of nerve impulse through a nerve fibre, the po...
Once the events of depolarization have occurred, a nerve impulse or spike is initiated. Action potential is another name of nerve impulse. It lasts about 1 msec (millisecond). The stimulalted, negatively charged point on the outside of the membrane sends out an electrical current to the positive point (still polarized adjacent to it). This local current causes the adjacent inner part of the membrane to reverse its potential from –70 mV to +30 mV. The reversal repeats itself over and over until the nerve impulse is conducted through the length of the neuron
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During the transmission of nerve impulse through a nerve fibre, the po...
The transmission of nerve impulse through a nerve fibre involves changes in the electric potential across the plasma membrane of the neuron. This process is known as action potential and is characterized by a sequence of depolarization, repolarization, and hyperpolarization.
Depolarization:
- At the resting state, the inside of the neuron is negatively charged compared to the outside.
- When a stimulus triggers the opening of ion channels in the membrane, positively charged ions, such as sodium (Na+), rush into the cell, making the inside less negative.
- This shift to a less negative potential is called depolarization and can lead to the generation of an action potential.
Repolarization:
- Once the membrane potential reaches a certain threshold, more ion channels open, causing a rapid influx of Na+ ions and a subsequent efflux of potassium (K+) ions.
- This results in a change in the polarity of the membrane potential, where the inside becomes negative again.
- This process is called repolarization, and it returns the membrane potential to its resting state.
Hyperpolarization:
- After repolarization, the membrane potential may briefly become more negative than the resting state. This is because some K+ channels remain open, and K+ ions continue to leave the cell.
- This overshoot of the resting potential is called hyperpolarization and makes the neuron less excitable for a brief period.
In summary, the electric change on the inner side of the plasma membrane during the transmission of nerve impulse through a nerve fibre is first negative (resting state), then positive (depolarization), then back to negative (repolarization), and may briefly become more negative than the resting state (hyperpolarization). Therefore, the correct option is D, "First negative, then positive and again back to negative."
Depolarization:
- At the resting state, the inside of the neuron is negatively charged compared to the outside.
- When a stimulus triggers the opening of ion channels in the membrane, positively charged ions, such as sodium (Na+), rush into the cell, making the inside less negative.
- This shift to a less negative potential is called depolarization and can lead to the generation of an action potential.
Repolarization:
- Once the membrane potential reaches a certain threshold, more ion channels open, causing a rapid influx of Na+ ions and a subsequent efflux of potassium (K+) ions.
- This results in a change in the polarity of the membrane potential, where the inside becomes negative again.
- This process is called repolarization, and it returns the membrane potential to its resting state.
Hyperpolarization:
- After repolarization, the membrane potential may briefly become more negative than the resting state. This is because some K+ channels remain open, and K+ ions continue to leave the cell.
- This overshoot of the resting potential is called hyperpolarization and makes the neuron less excitable for a brief period.
In summary, the electric change on the inner side of the plasma membrane during the transmission of nerve impulse through a nerve fibre is first negative (resting state), then positive (depolarization), then back to negative (repolarization), and may briefly become more negative than the resting state (hyperpolarization). Therefore, the correct option is D, "First negative, then positive and again back to negative."
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During the transmission of nerve impulse through a nerve fibre, the po...
During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has first negative charge, due to the high concentration of potassium ions inside high concentration of sodium outside. This state is known as resting phase and the potential is known as rest potential. The nerve cells are stimulated by nerve signals the voltage-gated sodium channels reverse the membrane polarity which makes the inner side of the membrane positive while outer turns negative. The potential generated at this phase is known as the action potential. As the action potential reaches its maximum value it again causes the reversal of membrane potential which by closing the sodium channels and opening the potassium channels. This state of the neuron is known as repolarization.
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During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric change? [2007]a)First positive, then negative and continue to be positiveb)First negative, then positive and continue to be positive.c)First positive, then negative and again back to positived)First negative, then positive and again back to negativeCorrect answer is option 'D'. Can you explain this answer?
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During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric change? [2007]a)First positive, then negative and continue to be positiveb)First negative, then positive and continue to be positive.c)First positive, then negative and again back to positived)First negative, then positive and again back to negativeCorrect answer is option 'D'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric change? [2007]a)First positive, then negative and continue to be positiveb)First negative, then positive and continue to be positive.c)First positive, then negative and again back to positived)First negative, then positive and again back to negativeCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric change? [2007]a)First positive, then negative and continue to be positiveb)First negative, then positive and continue to be positive.c)First positive, then negative and again back to positived)First negative, then positive and again back to negativeCorrect answer is option 'D'. Can you explain this answer?.
During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric change? [2007]a)First positive, then negative and continue to be positiveb)First negative, then positive and continue to be positive.c)First positive, then negative and again back to positived)First negative, then positive and again back to negativeCorrect answer is option 'D'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric change? [2007]a)First positive, then negative and continue to be positiveb)First negative, then positive and continue to be positive.c)First positive, then negative and again back to positived)First negative, then positive and again back to negativeCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric change? [2007]a)First positive, then negative and continue to be positiveb)First negative, then positive and continue to be positive.c)First positive, then negative and again back to positived)First negative, then positive and again back to negativeCorrect answer is option 'D'. Can you explain this answer?.
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