Approximately what amount of $O_{2}$ reaches the tissues via $100 \ ml$ of blood (in $ml$)?

The presence of $CO_2$ in blood will lower $pH$ because $CO_2$ combines with . . . . . . ,with the rate of reaction increased by . . . . . . .

Haemoglobin is

$CO$ is more toxic than $CO_2$ because....

During one circulation of blood from lungs to the tissues and back through the circulatory system,the percentage of haemoglobin giving up its oxygen to the tissues is (in $\%$)

The movement of chloride ions into erythrocytes from the plasma to maintain osmotic balance during transport of gases is known as