Which specific condition triggers the "thirst" center in the hypothalamus?
A. Hyperosmolar extracellular fluid
B. Hypo-osmolar extracellular fluid
C. Elevated serum potassium level
D. Decreased serum potassium level
A
The thirst mechanism is triggered when the osmoreceptors of the hypothalamus detect that the extracellular fluid is hyperosmolar, especially when the serum sodium level is elevated. Other conditions that trigger the thirst centers include hypotension and hypoxemia.
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