Why do you think the blood ph stays neutral while the same amount of lactic acid in water was very acidic

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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the pic attached shows the stages of mitosis. hope it !

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.