When the concentration of sodium ion in the ECF increases,
A) osmoreceptors are stimulated.
B) there is a decreased thirst.
C) ADH secretion decreases.
D) aldosterone secretion increases.
E) there is an increase in the volume of urine produced.

Question

Quizplus · Accepted Answer

An increase in sodium ion concentration in the extracellular fluid (ECF) leads to an increase in osmolarity, which stimulates osmoreceptors. This, in turn, triggers mechanisms to restore osmotic balance, such as increasing thirst and ADH secretion to conserve water.

When the Concentration of Sodium Ion in the ECF Increases