Do Our Kidneys Do Anything Else

Beyond regulating the composition of our blood, the kidneys engage in other operations involved in homeostasis. For instance, our kidneys are very sensitive to the amount of oxygen being transported in the blood. If they detect that the level of oxygen in our blood is too low, they will release a substance (hormone) into the blood that tells bones to make more RBCs. If there are more RBCs, then logically more oxygen can be transported in the blood. Furthermore, the kidneys are vital in the normal metabolism of vitamin D, which will be discussed in Chapter 9.

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