Answer the following question given this paragraph: 

pH Regulation Recall that enzymes lose their three-dimensional conformation and, therefore, their function if the pH is too acidic or basic. This loss of conformation may be a consequence of the breaking of hydrogen bonds. Move the pH away from the optimum for a specific enzyme and you may severely hamper its function throughout the body, including hormone binding, central nervous system signaling, or myocardial contraction. Proper kidney function is essential for pH homeostasis.


Q: Proper kidney function is essential for homeostasis of what level, which in turn helps ensure the functioning of enzymes?

 Choices:

- oxygen

- calcium

- ions

- ph

A:
ph
