major buffer of acids to help maintain the pH in the blood within the range compatible with life

The major buffer system that helps maintain the pH in the blood within the range compatible with life is the bicarbonate buffer system. Here's a step-by-step explanation:

1. The bicarbonate buffer system consists of bicarbonate ions (HCO3-) and carbonic acid (H2CO3).

2. When the pH of the blood drops (becomes more acidic), the bicarbonate ions can react with the excess hydrogen ions (H+) to form carbonic acid. This reaction reduces the amount of hydrogen ions in the blood, thereby increasing the pH back towards the normal range.

3. Conversely, when the pH of the blood rises (becomes more basic), the carbonic acid can dissociate into bicarbonate ions and hydrogen ions. The release of these hydrogen ions helps lower the pH back towards the normal range.

4. This system is constantly at work in the body, helping to maintain the blood's pH within the narrow range that is compatible with life (approximately 7.35 to 7.45).

5. The kidneys and lungs play a crucial role in maintaining this buffer system. The kidneys regulate the concentration of bicarbonate in the blood, while the lungs control the level of carbonic acid by adjusting the rate of respiration.

6. If the buffer system is overwhelmed by too much acid or base, or if the kidneys or lungs are not functioning properly, it can lead to a dangerous condition known as acidosis or alkalosis.