2.74 ADH

Notes


ADH = regulates water content of blood / control &alter composition of water in blood / more or less concentrated
--> Anti-diuretic hormone
--> Produced in hypothalamus
--> Flows through bloodstream --> kidney
**concentration must be right for osmoregulation (2.68b)

ADH targets collecting duct specifically
--> Collecting duct where water is selectively reabsorbed into bloodstream
--> ADH controls pores in the wall (more/less porous) to control 'flow' into bloodstream (more ADH ---> more porous)

Consequence of (more) ADH secretion
--> Urine more concentrated (more blood flows back into bloodstream)
--> Lower volume of urine

Questions?
ADH (hot day) = more ADH (more water available for sweat through the skin)
ADH (cold day) = less/no change ADH?
ADH (dehydrated) = more ADH (more water available for use in the body)