The kidneys are important regulators of blood volume and thus MAP) and the ionic composition and pH of plasma. The amount of water reabsorbed or lost is hormonally regulated. Both the amount of blood that is iltered (glomerular filtration rate) and the amount of water that is reabsorbed is determined by hormones binding with receptors. In order to understand why the evel of any given hormone is elevated or low in the blo t is necessary to think in terms of homeostasis loops fc each hormone, and what the initial disturbance to omeostasis was In otber words "who started it"

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