Multiple choice

In cardiac muscle, the excitation contraction coupling method is dependent on an anomaly famed as calcium-induced calcium release. Which of the following statements is true regarding excitation contraction coupling in cardiac muscles?

  1. Intracellular Ca+2 is drawn by endoplasmic reticulum ATPase pump.

  2. The cytoplasmic calcium binds to troponin T.

  3. The ryanodine receptors find out the increase in intracellular calcium ions.

  4. The action potential propogates across the T-tubules.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This statement is incorrect as cytoplasmic calcium binds to troponin C instead of troponin T making the troponin complex to move off the actin binding site allowing the myosin head to bind to the actin filament.

Keep practicing — related questions