THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -ADH acts on aquaporin-2, a membrane protein that forms gated water channels in the wall of the collecting ducts. These channels allow water to pass rapidly through the plasma membrane.

Detailed explanation-2: -ADH affects the permeability of the kidney tubules. ADH increases the permeability of the collecting duct of the kidney nephron. This means that more water is reabsorbed, so less water is excreted.

Detailed explanation-3: -The main action of ADH in the kidney is to regulate the volume and osmolarity of the urine. Specifically, it acts in the distal convoluted tubule (DCT) and collecting ducts (CD).

Detailed explanation-4: -ADH is released by the posterior pituitary in response to increased osmolarity of blood plasma or dehydration. The ADH travels through the blood stream to the collecting ducts of the kidneys. Here it causes the insertion of water channels called aquaporins into the walls of the collecting duct.