Did you and Aliffia Rahmawati get the same homework assignment? I see you are both at the same institution, asking the same question at the same time. Maybe this is something you should find out for yourselves.

Diuretics are one of the first-line drugs for managing hypertension that has been shown to be evidence-based. The link between hypertension and fluid overload and salt hypersensitivity especially among blacks is one plausibility for its continuous use and relevance in combination therapy. They work by reducing sodium reabsorption in the proximal convoluted tubules or distal convoluted tubules depending on the type of diuretics or by increasing potassium reabsorption and by this blood pressure is reduced.

Diuretics expel sodium not only in the nephron but also in the smooth muscle cells of the arterioles. This makes the intracellular milieu electrical more negative, the distance to the treshold potential becomes higher making the contraction more difficult. Less contraction = vasodilation. In chronic use diuretics work as vasodilators.