Which Is TRUE About the Comparison of Excitation-Contraction Coupling in Cardiac

question 114

Multiple Choice

Which is TRUE about the comparison of excitation-contraction coupling in cardiac muscle with that in skeletal muscle?

• A) Extracellular Ca²⁺ plays a major role in cardiac but not skeletal muscle.
• B) The mechanism for Ca²⁺ release from the sarcoplasmic reticulum is the same in both types of muscle.
• C) Troponin sites are completely saturated immediately after Ca²⁺ release in both types of muscle.
• D) There is no net change in total intracellular Ca²⁺ concentration in either muscle.
• E) Intracellular Ca²⁺ stores are necessary for contraction in skeletal muscle, but not in cardiac muscle.

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