Osmoregulation
- Created by: Sarah
- Created on: 27-01-15 11:06
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- OSMO- REGULATION
- the control of water levels and salt levels in the body
- to prevent problems with osmosis
- RBC's
- haemolysed
- RBC's
- ADH
- antidiuretic hormone
- released by posterior pituitary glands
- acts on collecting duct
- first messenger: binds to receptors
- adenyl cylase: ATP-->cAMP
- enzymecontrolled reactions
- aquaporins inserted in cell membrane
- more channels for water to flow through
- adenyl cylase: ATP-->cAMP
- broken down
- half life of 20 mins
- otherwise continually acts on collecting ducts
- membranes infold to create new vesicles (endocytosis)
- DETECTION
- osmoreceptors
- shrink when low water potential
- stimulate neurosecretory cells
- found in hypothalamus
- neurosecretory cells
- release AHD inot the blood
- action potential down axon
- manufacture AHD in cell body
- differs from other nerve cells
- hormones made in cell body
- hormone into blood rather than other nerve cell
- posterior pituitary gloands
- where AHD is stored
- released when action potential passes down the axon
- osmoreceptors
- decrease in water potential
- MORE ADH
- exocytosis of aqaua porins
- MORE permeable
- LESS urine produced
- MORE reabsorped
- increase in water potenital
- endocytosis of aquaporins
- LESS ADH
- LESS permeable
- LESS reabsorped
- MORE urine produced
- example of negative feedback control
- DRUGS + HORMONES
- Antiduretics
- LESS water lost
- MORE permeable membrane
- MORE aquaporins
- treatments for
- diabetes
- bed wetting
- Diuretics
- LESS aquaporins
- LESS permeable membrane
- MORE water lost
- treatments for
- coffee
- relieve water retention
- reduce swelling
- reduce high blood pressure
- Antiduretics
- WATER
- LOST
- urine
- sweat
- water vapour in exhaled air
- faeces
- LOST
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