_____ in the blood respond almost instantly to small changes in pH. Their levels can be altered by two of the body's systems: the _____ and _____.

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Anatomy refers to the internal and external structures of the body and their physical relationships, whereas physiology refers to the study of the functions of those structures.


1. _____ in the blood respond almost instantly to small changes in pH. Their levels can be altered by two of the body's systems: the _____ and _____.