Blood ph may become unbalanced if the rate of breathing is too fast or too slow.
Mammals breathe with lungs.
Blood ph may become unbalanced if the lungs are working too fast or too slow.
What may become unbalanced if the lungs are working too fast or too slow?

  Decibels
  hair on head
  air pressure
  gasoline levels
  Acids
  energy usage
  brain chemistry
  blood pH