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In page Contraction alkalosis:

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Increases in angiotensin II cause increased Na+–H+ exchange in the proximal tubule and increased HCO3 (bicarbonate) reabsorption in the proximal tubule due to increased luminal H+. Increased aldosterone secretion stimulates the H-ATPase of alpha-intercalated cells of the collecting duct, which causes 1) increased distal tubule H+ secretion, worsening the metabolic alkalosis, and 2) increased generation of "new" bicarbonate within these same cells, which will be reabsorbed.[citation needed]