Oxygen dissociation curve shifts towards left due to increase in . . . . . . during internal respiration.

During $CO_2$ transport,the movement of chloride ions across the membrane of $RBCs$ from plasma is called . . . . . . .

If $pH$ of blood is artificially changed to $8$,what is most likely to happen?

In lungs,in order to facilitate the removal of $CO_2$ from the blood,there is an exchange of ions between $RBC$ and the plasma which involves the movement of:

Oxyhaemoglobin can transport

$A$: Human blood always contains a higher amount of $CO_2$ than $O_2$.
$R$: The solubility coefficient of $CO_2$ is higher than that of $O_2$.