ADH & Osmoregulation
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Last updated 2:39 AM on 11/22/22
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16 Terms
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Osmolarity
measurement of how concentrated solutes are in a solution. higher solute concentration = higher osmolarity
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What is osmolarity controlled by?
the hypothalamus through the pituitary gland
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What does the pituitary gland do?
releases hormone ADH into bloodstream
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How does ADH work?
binds to receptors in collecting duct - makes membrane more permeable to water. water flows OUT of collecting duct to peritubular capillaries - darker urine.
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When will ADH be released?
when the osmolarity in our bodies is high
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1
Hypothalamus
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Pituitary gland (releases ADH)
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thirst
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drinking water to relieve thirst
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osmolarity returns to set point
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ADH
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Collecting duct
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water
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Peritubular capillaries
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high water concentration in blood - osmolarity decrease
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How does ADH make the collecting duct's membrane more permeable to water?
inserts aquaporins (protein channels) onto membrane
