With which part of $Hb$,$O_2$ molecules bind?

Which is called Hamburger shift?

$A$ major percentage $(97 \%)$ of $O_{2}$ is transported by RBCs in the blood. How is the remaining percentage $(3 \%)$ of $O_{2}$ transported?

If ${O_2}$ concentration in tissue was almost as high as at the respiratory surface,what would happen?

Bulk of carbon dioxide $(CO_2)$ released from body tissues into the blood is present as

$A$ decrease in the $pH$ of blood leads to: