Thirst is activated bya) Increased Angitension II levelb) Extracellular hyperosmolarityc) Increaed ANP levelsd)  Increased Renin levels
When plasma osmolarity increases, the Osmoreceptors are activated which results in increased thirst. Similarly, when hypovolemia occurs, Renin-Angiotensin mechanism gets activated which causes increase in Angiotensin II that stimulates the satiety centre.
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