In Cardiac Muscle

question 121

Multiple Choice

In cardiac muscle

• A) calcium ions do not bind to troponin molecules.
• B) calcium ions play no role in the process of contraction.
• C) calcium ions play an important role in repolarizing the membrane after the depolarization phase.
• D) at least half of the calcium ion required for contraction comes from outside the cell.
• E) calcium ions are not released from the sarcoplasmic reticulum.

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