In blood,$CO_2$ is mainly transported through

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?

Carbon monoxide combines with haemoglobin to form . . . . . . .

How many molecules of $H_2CO_3$ are formed due to the presence of carbonic anhydrase in the cytoplasm every second?

How does carbon monoxide inhibit the transport of oxygen?

Each haemoglobin molecule can carry a maximum of