39 Multiple Choice 2 points In which event of a muscle cell action potential do potassium channels open and K+ ions rush out of the cell? Refractory period Rapid depolarization Stimulus Repolarization
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Step 1: The question asks which event in a muscle cell action potential involves the opening of potassium channels and the subsequent efflux of $K^+$ ions. Show more…
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Briefly describe the events leading a conducting cell to an action potential and choose the method of depolarization: sodium or calcium. Choose 4 answers. a) A few sodium channels open, voltage-gated potassium channels close, voltage-gated (slow) calcium channels begin opening, depolarizing the cell to the threshold potential. b) Rapid depolarization due to voltage-gated fast sodium channels opening and the membrane being permeable to sodium. c) Voltage-gated (fast) calcium channels close, voltage-gated potassium channels open for rapid repolarization. d) At +30 mV, fast sodium channels close and slow calcium channels open, allowing calcium ions to enter the sarcoplasm from the extracellular fluid. e) When slow calcium channels close, slow potassium channels open, resulting in a rush of potassium ions out of the cell for rapid repolarization to resting potential. f) Voltage-gated (fast) calcium channels open for rapid depolarization. g) Depend on sodium influx for depolarization. h) Depend on calcium influx for depolarization.
Adi S.
Briefly describe the events leading a conducting cell to action potential and choose the method of depolarization: sodium or calcium. Choose 4 answers. Read cardiac physiology reference and conducting cells.rtf to help answer this question. Few sodium channels open, voltage-gated potassium channels close, voltage-gated (slow) calcium channels begin opening, depolarizing the cell to threshold potential. Rapid depolarization due to voltage-gated fast sodium channels open and the membrane is permeable to sodium. Voltage-gated (fast) calcium channels close, voltage-gated potassium channels open for rapid repolarization. At +30 mV fast sodium channels close and slow calcium channels open, allowing calcium ions to enter the sarcoplasm from the extracellular fluid. When slow calcium channels close, slow potassium channels open, resulting in a rush of potassium ions out of the cell for rapid repolarization to resting potential. Voltage-gated (fast) calcium channels open for rapid depolarization. Depend on sodium influx for depolarization. Depend on calcium influx for depolarization.
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