What do you understand by glycoside?

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All of the following statements regarding cardiac glycosides are true EXCEPT:

a) They inhibit the Na+/K+-ATPase and thereby increase intracellular Ca++ in myocardial cells

b) They cause a decrease in vagal tone

c) Children tolerate higher doses of digitalis than do adults

d) The most frequent cause of digitalis intoxication is concurrent administration of diuretics that deplete K+

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