WATER DEFICIT

• INCREASED OSMOLARITY SENSED BY HYPOTHALAMIC WATER RECEPTORS

• FALL IN ECF VOLUME

• FALL IN ARTERIAL BLOOD PRESSURE

STIMULATION

OF HYPOYHALAMIC

NEURONS

INCREASED THIRST

INCREASED WATER INTAKE

DECREASED PLASMA OSMOLARITY

INCREASED VASOPRESSIN

OPEN PORES

IN COLLECTING

DUCT

MORE WATER REABSORBED

FALL IN URINE OUTPUT

ARTERIOLAR

VASOCONSTRICTION

DECREASED PLASMA OSMOLARITY

RELIEVES

RELIEVES

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