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Isabella Rosellini

on 20 November 2012

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Transcript of Osmoregulation

the process which regulates the concentration and osmotic pressure of blood by regulating the water contents of blood plasma. OSMOREGULATION Negative Feedback Mechanism in Control of Water Balance What is it ? Self-regulating responses that restores the system to its default state when changes are experienced, usually due to external influences. Conditions in the body change from set point change detected corrective mechanisms activated conditions returned to set point NEGATIVE FEEDBACK MECHANISM corrective mechanisms switched off water regulation: It is important because: excessive loss excessive intake dilute body fluids (-) (+) dehydration A change in water concentration leads to Osmoreceptors on the hypothalamus detect water concentration and its changes. The hypothalamus sends chemical messages to the pituitary gland that secretes anti-diuretic hormone (ADH). ADH is carried by the blood to the kidneys. ADH increases/decreases the permeability of the kidney tubules more/less allowing water to be reabsorbed from the tubules into the blood, depending on the change of water concentration. 1 2 3 4 If more water is required in the bloodstream: If less water is required in the bloodstream: 5 High concentrations of ADH make the tubules more permeable.
More water is reabsorbed, less water is lost as urine.
Low concentrations of ADH make the tubules less permeable.
Less water is reabsorbed, more water is lost as urine.
I make urine... water norm. water norm. water water osmoreceptors osmoreceptors less ADH more ADH pituitary pituitary no deviation
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