1.

Thirst can be A. Produced by a rise in plasma tonicity. B. Produced by stimulation of certain areas in the hypothalamus. C. Produced by a fall in blood volume. D. Associated with decreased secretion of ADH. E. Relieved by water intake before the water has been absorbed from the gut.

Answer»

A. True Stimulation of osmoreceptors by the increased tonicity generates thirst sensation. 

B. True The supraoptic nucleus of the hypothalamus contains osmoreceptors. 

C. True This can happen, even though blood tonicity is unchanged; volume receptors may be involved. 

D. False ADH secretion is increased. 

E. True Flushing out the mouth with water can provide temporary relief from thirst.



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