Which one of the statements about the collecting ducts is true? The collecting duct absorbs: A. calcium if parathyroid hormone is present. B. water if antidiuretic hormone is present. C. sodium if atrial natriuretic hormone is NOT present. D. urea
Option B. ADH reason aquaporins (water channels) to be inserted into the collecting duct walls. The collecting duct is impermeable to the other substances.
