The transport of carbon dioxide from tissues to the respiratory surface occurs primarily through ..........

How many molecules of $O_2$ can one molecule of hemoglobin carry?

The toxic effect of carbon monoxide is due to its higher affinity for hemoglobin compared to oxygen. How many times higher is this affinity (in $\text{times}$)?

Carbon dioxide entering the red blood cells reacts with water to form carbonic acid. Which enzyme is responsible for this reaction?

Which of the following factors contribute to the binding of $O_2$ with hemoglobin?
$(a)$ Partial pressure of oxygen $(P_{O_2})$
$(b)$ Partial pressure of carbon dioxide $(P_{CO_2})$
$(c)$ Hydrogen ion concentration ($H^+$ concentration)
$(d)$ Temperature

The dissociation curve is associated with