How does your body decide how much water to send to your bladder, sweat pores and any other organs needing it?
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There are pressure sensing cells in some of your arteries. When the blood pressure is too high, they signal the kidneys to remove water from your blood and for the arteries to relax a bit. This tends to lower blood pressure. When the blood pressure is too low, they signal arterial constriction and water retention, which increases your blood pressure. Your kidneys will filter out sodium and other electrolytes and then reabsorb them. When you eat too much sodium, it tends to make you retain water, which increases your blood pressure.
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