Which is the respiratory pigment or oxygen carrier in frogs?

Carbonic anhydrase is found in

Select the correct option:
$(1)$ Approximately $97\%$ of $O_2$ is transported by plasma / RBCs.
$(2)$ The primary site of gas exchange is alveoli / bronchioles.

Which of the following combines irreversibly with blood haemoglobin?

In lungs,there is a definite exchange of ions between $RBC$ and plasma. The removal of $CO_2$ from the blood involves:

Identify the given curve.