The answer is a) Calcium and potassium.

Here's the step by step explanation:

1. The myocardial action potential consists of five phases (0 to 4).

2. The plateau phase, also known as phase 2, is characterized by a balance between inward (depolarizing) and outward (repolarizing) currents. This balance results in a prolonged period of depolarization, which is unique to cardiac muscle cells.

3. During this phase, the membrane is most permeable to calcium and potassium ions.

4. The slow influx of calcium ions (Ca2+) through L-type calcium channels and the slow efflux of potassium ions (K+) through slow delayed rectifier potassium channels are the primary ionic movements during this phase.

5. Therefore, during the plateau phase of the myocardial action potential, the membrane is most permeable to calcium and potassium.

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The answer is a) Calcium and potassium.

Here's the step by step explanation:

1. The myocardial action potential consists of five phases (0 to 4).

2. The plateau phase, also known as phase 2, is characterized by a balance between inward (depolarizing) and outward (repolarizing) currents. This balance results in a prolonged period of depolarization, which is unique to cardiac muscle cells.

3. During this phase, the membrane is most permeable to calcium and potassium ions.

4. The slow influx of calcium ions (Ca2+) through L-type calcium channels and the slow efflux of potassium ions (K+) through slow delayed rectifier potassium channels are the primary ionic movements during this phase.

5. Therefore, during the plateau phase of the myocardial action potential, the membrane is most permeable to calcium and potassium.

Knowee AI · Accepted Answer

The answer is a) Calcium and potassium.

Here's the step by step explanation:

1. The myocardial action potential consists of five phases (0 to 4).

2. The plateau phase, also known as phase 2, is characterized by a balance between inward (depolarizing) and outward (repolarizing) currents. This balance results in a prolonged period of depolarization, which is unique to cardiac muscle cells.

3. During this phase, the membrane is most permeable to calcium and potassium ions.

4. The slow influx of calcium ions (Ca2+) through L-type calcium channels and the slow efflux of potassium ions (K+) through slow delayed rectifier potassium channels are the primary ionic movements during this phase.

5. Therefore, during the plateau phase of the myocardial action potential, the membrane is most permeable to calcium and potassium.

Q5. During the plateau phase of the myocardial action potential the membrane is most permeable to _____________ .a) Calcium and potassiumb) Sodium and potassiumc) Calcium and sodiumd) Calcium and magnesium

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