Ion movements across the cell membrane are recorded coupled with changes in membrane potential in an isolated heart muscle cell (see graph below). . Which of the following ion sequences corresponds to regions 1-2-3 on the graph, respectively?

Question

Ion movements across the cell membrane are recorded coupled with changes in membrane potential in an isolated heart muscle cell (see graph below). .  Which of the following ion sequences corresponds to regions 1-2-3 on the graph, respectively?

Quizplus · Accepted Answer

Eductional Objective: Fast depolarization (phase 0), early rapid repolarization (phase 1), plateau (phase 2), late rapid repolarization (phase 3), and resting potential make up the cardiac myocyte action potential (phase 4). Increased membrane permeability to Na+ and Ca++ and decreased membrane permeability to K+ are both related to the action potential.

Ion Movements Across the Cell Membrane Are Recorded Coupled with Changes