Final answer:
Blood buffers help maintain the pH of the blood within a narrow range, improving performances lasting longer than 20 minutes.
Step-by-step explanation:
Blood buffers help maintain the pH of the blood within a narrow range, which is crucial for the proper functioning of cells and proteins in the body. The primary blood buffer system is the carbonic acid/hydrogen carbonate buffer system. This system works quickly, making adjustments to pH within seconds. Therefore, blood buffers would most likely improve performances lasting longer than 20 minutes, as they help maintain the optimal pH for cellular functions.