BIOL 121 Lecture Notes - Lecture 31: Starling Equation, Chymosin, Distal Convoluted Tubule

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19 Nov 2020
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One of the main function of the kidneys is to regulate water in the body. Kidneys only reabsorb the water that is in the filtrate before it goes to the bladder. Water balance is regulated by antidiuretic hormone adh in the kidneys (vasopressin) Adh is produced in the hypothalamus and released from the posterior pituitary. The variable in this case is water and the sensors are osmoreceptors. Osmoreceptors are located in the hypothalamus of the brain and respond to changes in body fluid concentrations. Dehydration will concentrate the body fluids increasing their osmolarity. This causes the osmoreceptors to lose water by osmosis and shrink. As a result, shrinking osmoreceptors will signal the posterior pituitary to release. Adh will then cause kidneys to reabsorb water from the distal tubule & Overhydration will dilute the body fluids decreasing their osmolarity. As a result, less adh will be released, less water will be reabsorbed in the distal.

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