Question

35 multiple choice 2 points the collecting duct is selectively permeable to water depending on the presence of vasopressin which opens _______. aquaporins macula densa perforins vasa recta

Explanation:

Vasopressin (antidiuretic hormone) acts on the collecting duct of the kidney. It binds to receptors and triggers the insertion of aquaporin - 2 water channels into the apical membrane of the collecting - duct cells, making the collecting duct permeable to water. Macula densa is part of the juxtaglomerular apparatus and is involved in regulating the glomerular filtration rate. Perforins are proteins involved in the immune response, used by cytotoxic T - cells and natural killer cells to create pores in target cells. Vasa recta are the capillaries that run parallel to the loop of Henle and are involved in the counter - current exchange mechanism in the kidney but are not related to the action of vasopressin on water permeability.

Answer:

A. aquaporins