controlof water content in the Blood - osmoregulation
Yousawearllerhowthekidneyspreyentthebodyfrombecoming
dehydratedbyabsorbingwaterfrornthefiltrateandproducing
.rn.rnt*t*d urine. vou rnay also have noticed that when you drink more
fluidn the amount of urine produced increases in quantity and becomes
paler"
The ability of the kidneys to increase or decrease water absorption in the
tub*.rles is controlled Ly tne am&rnt of antidiuretic horrnone $DfN)
circr.llating in the blood. This hormone increases the permeability of the
distal tu*le and the coltecting duct to water. fu a result, m*re water can
be reabsorbed from the urine. Production of ADH is in turn r*gulated by
L*pror.*lls in the brain tlrat monitor the concentration of blood, and by
receptors in the heart that rnonitor blood volume'
what happens when a person starts to lcse a lot of waterthrough vigorous
exercisei iigure 6.10 explains the interactions that occur in l"ris body'