This happens because blood has its own buffers which maintain the pH. Alkaline (high pH) buffers are released into the blood stream when the blood becomes too acidic, and conversely, acidic buffers (low pH) are released if the blood pH becomes too alkaline.
The blood pH is maintained within a pH range of 7.35 - 7.45. This is because our body’s immune system needs to operate in optimal conditions and thus, be able to fight off illness and disease.
Due to the presence of buffers in the human blood that neutralizes the blood pH.
The blood pH stays neutral when the same amount of lactic acid is added to the blood because of the presence of buffer in the human blood. This buffer neutralizes the pH and maintain it in the normal range.
Human blood contains a buffer of carbonic acid (H2CO3) and bicarbonate anion (HCO3-) that maintain blood pH in the range of 7.35 and 7.45. If the blood pH exceeds from 7.8 and lowers from 6.8 then this will leads to death so the buffers maintains the pH of the blood in the normal range.
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