The thirst response is stimulated by:
a. an increase in plasma volume.
b. a decrease in plasma osmolality
c. stimulation of cytoplasmic osmoreceptors.
d. an increase in plasma osmolarity
e. an increase in blood volume

c. stimulation of cytoplasmic osmoreceptors, d. an increase in plasma osmolarity.

Explanation:

The plasma osmolarity is monitored by the forebrain, the subfornical organ (SFO) and organum vasculosum of the lamina terminalis (OVLT).

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