4. Hormones: Matching Parathyroid hormone Aldosterone Calcitriol Antidiuretic hormone Atrial natriuretic peptide Angiotensin II Erythropoietin A. Stimulated by high blood volume. This hormone causes mesangial cells in the glomerulus to increase capillary surface area to increase filtration rate. Also increases excretion of sodium in urine and thus diuresis. B. Stimulated by low plasma levels of calcium. This hormone targets the distal convoluted tubule to increase reabsorption of calcium. C. Stimulated by low circulating red blood cells. Secreted by kidneys to stimulate erythropoiesis by red bone marrow. D. Stimulated by low blood volume/pressure. This hormone causes constriction of afferent and efferent arterioles to decrease filtration rate. Also increases reabsorption of sodium, other solutes, and water. E. Active Vitamin D produced by kidneys to increase dietary absorption of calcium. F. Stimulated by angiotensin II and high plasma levels of potassium. This hormone causes reabsorption of sodium, chloride, and water and secretion of potassium. G. Stimulated by high osmolarity. This hormone causes insertion of aquaporin-2 channels of principal cells of the collecting ducts. Results in reabsorption of water.

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