During Phase 2 of the action potential in cardiac myocytes, there is:Group of answer choicesAn influx of Na+ ionsBalance between inward K+ and outward Ca++ An influx of Ca++ ionsA brief current of repolarization
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During an action potential in a myocardial contractile cell, the membrane potential changes that occur are a result of _________. A. sodium influx through voltage-gated sodium channels during the rapid depolarization phase, and potassium efflux during the repolarization phase. B. potassium influx through voltage-gated potassium channels during the rapid depolarization phase, and sodium efflux during the repolarization phase. C. sodium influx through If channels, followed by calcium influx through voltage gated calcium channels during the depolarization phase, and potassium efflux during the repolarization phase. D. potassium influx through voltage-gated potassium channels that brings the membrane potential to threshold, followed by sodium influx through voltage gated sodium channels during the rapid depolarization phase, and potassium efflux during the repolarization phase. E. sodium influx through voltage-gated sodium channels through the depolarization phase, followed by potassium efflux through voltage gated potassium channels and calcium influx through voltage-gated calcium channels during the plateau phase, and potassium efflux during the repolarization phase.
Madhur L.
The influx of which ion accounts for the plateau phase? a. sodium b. potassium c. chloride d. calcium
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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