h20 reabsorption

[donaldduck]

If there is high NaCl concentration in the blood plasma will vasopressin be released to cause water to be reabsorbed into the bloodstream? Also, if there is high NaCl in the blood how is the blood pressure affected? Also, where does the greatest amount of reabsorption take place?

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[PiBond]

to your first question: yes, vasopressin will be released as a result of high plasma osmolarity.

2nd question: as a result of water reabsorption via the action of vasopressin, blood pressure with increase since we are increasing blood volume

3rd question: there is bulk reabsorption of ions, amino acids, glucose, etc in the proximal convoluted tubule (around 70% of filtrate). essentially we're going to be taking back all the stuff the body can use that it doesn't want to get rid of. we'll be fine tuning the filtrate via the action of aldosterone/vasopressin in the distal nephron based on the needs of the body as well, but usually to a lesser degree