Positive inotropic agents often promote inflow of which cation to increase contractility of the heart?

Question

Quizplus · Accepted Answer

Positive inotropic agents are substances that increase the contractility of the heart by promoting the inflow of calcium ions into the cardiac muscle cells. Calcium ions bind to troponin, leading to the interaction between actin and myosin and contraction of the cardiac muscle. Sodium, potassium, magnesium, and phosphorus ions do not directly contribute to the contractility of the heart in the same way as calcium ions.

Positive Inotropic Agents Often Promote Inflow of Which Cation to Increase