The Kidneys and Homeostasis B2

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The Kidneys and Homeostasis
The kidney as an organ of excretion, it is more than that. It does remove wastes, but it also
removes normal components of the blood that are present in greater-than-normal
concentrations. When excess water, sodium ions, calcium ions, potassium ions, and so on is
present, the excess quickly passes out in the urine. On the other hand, the kidneys step up
their reclamation of these same substances when they are present in the blood in
less-than-normal amounts. Thus the kidney continuously regulates the chemical composition
of the blood within narrow limits. The kidney is one of the major homeostatic devices of the
The process how the kidneys work when there is too little water in the body and they maintain the
water levels so the levels are normal. When the water levels are too little, the hypothalamus in the
brain detects it and makes the pituitary gland releases ADH which the kidneys detect and maintains
the blood water level so there is less water lost in urine by making it more concentrated. The blood
levels then returns to normal.

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When there is too much water in the body, the hypothalamus detects the increase in water levels
and makes the pituitary gland to release les ADH. When the kidneys detect the change, it reduces
the blood water level so more water reaches the bladder thus giving more dilute urine, more often.
This brings back the water level back to normal.…read more

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