During Contraction of Heart Muscle Cells

question 48

Multiple Choice

During contraction of heart muscle cells .

• A) the action potential is initiated by voltage- gated slow calcium channels
• B) the action potential is prevented from spreading from cell to cell by gap junctions
• C) some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores
• D) calcium is prevented from entering cardiac fibers that have been stimulated

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