Chemical buffer systems
a. respond in one to three minutes to changes in hydrogen ion concentration
b. stimulate the respiratory center when acidosis occurs
c. promote H+ excretion by the kidneys when acidosis occurs
d. are the most powerful mechanism for regulating changes in [H+] within the body
e. buffer changes in acid or base levels
E
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This figure shows the femur. The feature indicated by number 6 is the
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