Which of the following statements regarding the effect of digitalis on cardiac c

Question

Which of the following statements regarding the effect of digitalis on cardiac contraction is incorrect?

a) Digitalis is an effective treatment for patients with failing hearts characterized by reducing cardiac pumping activity

b) Inhibition of the activity of the sodium-potassium pump inhibits the activity of the sodium-calcium exchanger and therefore prevents the action of digitalis

c) Digitalis increases the force of cardiac contraction by increasing the level of potassium level in the myocardium- the higher the level of potassiumin the heart, the stronger the contraction

d) Digitalis increases the level of calciumin in the myocardium by enhancing the activity of the sodium-calcium exchanger

Explanation / Answer

The following statement is incorrect regarding the effect of digitalis on cardiac contraction:

c) Digitalis increases the force of cardiac contraction by increasing the level of potassium level in myocardium- higher the level of potassium in heart, the stronger the contraction.

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