how does sodium re absorption work in the renal system and why is it crucial to help water retention?
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Your kidneys are filters for your blood. As blood goes into them, everything that isn’t small enough to fit inside a red blood cell gets pulled out. Small chemical receptors then detect the concentration of various nutrients pulled out of your blood like sodium or potassium. If the sodium levels are too low, a chemical called renin is released from the kidney into the blood to be carried to the brain. They brain being the control center, detects the renin and released a hormone called aldosterone which goes into the blood and back to your kidneys. When the aldosterone reaches your kidneys, it tells your kidneys to keep water in your blood which is done by reabsorbing sodium back into the blood. That’s where the loop of Henle comes in, it has openings between the cells that can be opened or closed to regulate which nutrients can go back into the blood. In nature, water follows sodium so if the kidneys put more sodium into the blood, more water from the fluid in your kidneys will follow the sodium into your blood which increases blood volume which in turn increases blood pressure in order to move the blood through your body.
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