Saturday, November 5, 2011

2.74 - ADH.


ADH - Anti Diuretic Hormone 
Produced in the Hypothalamus (a part in the brain) - flows through the blood stream to it's target (the kidney)
- ADH - controls and alter the composition of water in blood - more or less concentrated
- Tissue is isotonic with the cytoplasm of the cell



ADH - targets the collecting duct (more accurate then kidney) 
- It allows more water to come out of the collecting duct 

- Collecting Duct - where water is selectively reabsorbed into the blood 
- possible to increase the amount of water going into the blood by adding the hormone, ADH
- It makes the collecting duct walls more porous - so that more water can escape from the collecting duct - this water goes back into the blood 
- consequence of ADH secretion - Urine coming out will be more concentrated and will have a lower volume 

- ADH response to a hot day 
- ADH response to a cold day 
- ADH response to dehydration


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