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Answer 1

d The V2 receptor is predominantly expressed on the membraneofthe distalconvoluted tubule and collecting ducts of the kidney. Binding of AVP to renal V2 receptorsstimulates the recruitment of selective waterchannels (aquaporins), which allowreabsorption of renal tubular water and concentration of urine.cThe thymus gland, located behind your sternum and between your lungs, is only active until puberty. After puberty, the thymusstarts to slowly shrink and become replaced by fat. Thymosin is the hormone of thethymus, and it stimulates the development of disease-fighting T cells.bProtein metabolism aGlucagon's role in the body is to prevent blood glucose levels dropping too low. To do this, it acts on the liver in several ways: It stimulates the conversion of stored glycogen (stored in the liver) to glucose, which can be released into the bloodstream. This process is called glycogenolysis.