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: The '''kidney tubules''' are affected by [[Anti-diuretic Hormone|anti-diuretic hormone]].
: When there is not enough [[water]] in the [[blood]] the [[Pituitary Gland|pituitary gland]] [[secrete]]s [[Anti-diuretic Hormone|anti-diuretic hormone]] which causes the '''tubules''' to allow [[water]] back into the [[blood]].
: When there is too much [[water]] in the [[blood]] the [[Pituitary Gland|pituitary gland]] stops [[secrete|secreting]] [[Anti-diuretic Hormone|anti-diuretic hormone]] which causes the [[Kidney Tubule|tubules]] to stop allowing [[water]] back into the [[blood]].