<prompt> Which of the following actions does aldosterone secretion from the adrenal gland regulate in the kidney?Exchange of K for Na in the distal convoluted tubuleExchange of Na for K in the distal convoluted tubuleExchange of K for Na in the proximal convoluted tubuleExchange of Na for K in the proximal convoluted tubule  <response>: The distal convoluted tubule DCT in the kidney coex functions to reabsorb Na and secrete K. This is regulated by the adrenal hormone, aldosterone, as stimulated by angiotensin II, which will increase reabsorption of Na and secrete K. The DCT also functions in the continuation of bicarbonate ion reabsorption with hydrogen ion secretion. The terminal poion of the DCT is sensitive to antidiuretic hormone ADH from the neurohypophysis, which acts to increase the permeability of the tubule to water, resulting in concentrating the urine. Ref: Barrett K.E., Barman S.M., Boitano S., Brooks H.L. 2012. Chapter 20. The Adrenal Medulla Adrenal Coex. In K.E. Barrett, S.M. Barman, S. Boitano, H.L. Brooks Eds, Ganongs Review of Medical Physiology, 24e. 