During Contraction of Heart Muscle Cells ________

question 60

Multiple Choice

During contraction of heart muscle cells ________.

• A) all of the calcium required for contraction comes from storage in the sarcoplasmic reticulum
• B) some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores
• C) calcium is prevented from entering cardiac fibers that have been stimulated
• D) the action potential is prevented from spreading from cell to cell by gap junctions

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