Osmoregulation – hormonal control

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Presentation transcript:

Osmoregulation – hormonal control E1 Chapter 1 Osmoregulation – hormonal control

Case 1: After drinking a large amount of water Decrease permeability of collecting duct to water Decrease in ADH released by pituitary gland Detected by osmoreceptors in hypothalamus Negative feedback mechanism Smaller proportion of water is reabsorbed Increase in water potential in blood Drinking a lot of water Water potential of blood decreases A large volume of dilute urine produced Normal water potential in blood

Case 2: After heavy sweating or excessive loss of blood A small volume of concentrated urine produced Normal water potential in blood Water potential of blood increases e.g heavy sweating Negative feedback mechanism Greater proportion of water is reabsorbed decrease in water potential in blood Increase permeability of collecting duct to water Increase in ADH released by pituitary gland Detected by osmoreceptors in hypothalamus

After taking in excess salts Human blood: 0.9% salt concentration normally Maximum salt concentration in urine: 2% Sea water: ~ 3% salt What happens??? Excreted by diffusion & active transport A smaller amount of salt & small proportion of water is reabsorbed A large volume of urine with high salt concentration [salt] salt  osmosis H2O H2O Kidney tubule surrounding capillary

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