Which is called Hamburger shift?

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?

Although much carbon dioxide is carried in blood,yet blood does not become acidic because

What happens in Hamburger shift?

Carbonic anhydrase is found in .......... .

How much oxygen is delivered to the body tissues by blood during one circulation (in $\%$)?