Question
In which phase of the ventricular muscle action potential is the potassium permeability the highest? 1. 0 2. 1 3. 2 4. 3 1... 2.. 3.. 4..
Ask by Lyons Paul. in the United States
Feb 19,2025
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Answer
Potassium permeability is highest during phase 3 of the ventricular muscle action potential.
Solution
The potassium permeability is highest during phase 3 of the ventricular muscle action potential. In this phase, the opening of potassium channels increases K⁺ efflux, leading to repolarization of the cell membrane.
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During phase 3 of the ventricular muscle action potential, potassium permeability reaches its peak. This phase is characterized by the rapid repolarization of the membrane potential, largely due to the opening of voltage-gated potassium channels, allowing potassium ions to flow out of the cell and restore the resting membrane potential. It's fascinating to note that the precise timing of these ion movements is crucial for the heart's rhythmic contractions. Any disruptions in potassium permeability can lead to arrhythmias, showcasing the importance of understanding these phases for maintaining cardiovascular health.
