<prompt> Vasopressin acts through which channels in collecting duct?Aquaporin 1Aquaporin 2GLUT-1GLUT-4  <response>: Ans. B. Aquaporin 2a. Principal cells of collecting duct contain a regulated system of water channels antidiuretic hormone ADH, also called arginine vasopressin, AVP.b. ADH controls permeability of these cells to water by regulating insertion of pre-formed water channels aquaporin-2, AQP2 into apical membrane. 