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 $\%$)

What is the amount of $O_{2}$ supplied to tissues through every $100 \ ml$ of oxygenated blood under normal physiological conditions (in $ml$)?

If $ppCO_2$ is high and pH is low,then it will result in:
$i$. increase in affinity of haemoglobin for $O_2$
$ii$. decrease in affinity of haemoglobin for $O_2$
$iii$. oxygen dissociation curve shifts to left
$iv$. causes release of $O_2$ for diffusion into tissue cells
$v$. $H^+$ and $HCO_3^-$ ions combine to form carbonic acid

Which of the following substances does not inhibit the transport of oxygen in the blood?

Which enzyme is necessary for the synthesis of carbonic acid?

In what form is the $CO_2$ released from body tissues into the blood transported?