What provides the shortest-term mechanism for preventing acid-base imbalances in the body?

I believe that the chemical buffers provide the shortest term mechanisms for preventing acid-base imbalances in the body. Chemical buffers normally act within a fraction of a second to resist a pH change. On the other hand the longest mechanism is the kidney system which ordinarily requires from several hours to a day or more to affect changes in blood pH. 

This is what i found on google “phytoplankton, tiny organisms that live in the ocean, are autotrophs. some types of bacteria are autotrophs. most autotrophs use a process called photosynthesis to make their food.” i hope this you for what your looking for