You are presented with the quiz "Something critical for regulating oxygen from hemoglobin may become unbalanced if breathing is what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "blood pH may become unbalanced if the rate of breathing is too fast or too slow" and "for example, blood pH is critical for regulating the binding and release of oxygen from hemoglobin". 

So, what's the best answer to the question?


 

   too fast or too slow        