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Old 08-14-2012
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Question Na alterations and plasma osmolarity

Pls can someone explain this., Na + alterations do not affect plasma osmolarity, rather they affect effective circulating volume; H2O homeostasis and ADH determine plasma osmolarity.

I would have thought that Na+ would have something to do with plasma osmolarity.
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Old 08-14-2012
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think osmolarity as coc here which is maintained for Na at fairly constant due to movement of water to balance it,
however water and ADH have direct effect on its coc or osmolarity due to more straight control on amount of water
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