Oaubain acts by inhibiting: (A) Adenyl cyclase, (B) Ca+ chanells, (C) H+K+ ATPase, (D) Na+K+ATPase
Answer is D. Ouabain is a cardiac glycoside and in lower doses, can be used medically to treat hypotension and some arrhythmias. It acts by inhibiting the Na/K-ATPase, also known as the sodium-potassium ion pump Refer kDT 6/e p496