Although much carbon dioxide is carried in blood,yet blood does not become acidic because
- A$CO_2$ is continuously diffused through the tissues and is not allowed to accumulate
- B$CO_2$ combines with water to form $H_2CO_3$,which is neutralized by $Na_2CO_3$
- CIn $CO_2$ transport,blood buffers play an important role
- D$CO_2$ is absorbed by leucocytes
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Haemoglobin $(Hb)$ transports oxygen from the lungs to tissues. The partial pressure of oxygen in the lungs is different from that in the tissues. Each $Hb$ can bind to up to four oxygen molecules. Suppose we have an equal number of $Hb$ and oxygen molecules,and all the oxygen molecules are in a bound form. Then,which of the following is true?
How much oxygen is delivered to the body tissues by blood during one circulation (in $\%$)?
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