Zoology - Breathing and Exchange of Gases Question with Solution | TestHub

The contraction of diaphragm causes increases in the volume of thorax and the contraction of external intercostal muscles causes increase in the volume of thorax.

${\mathrm{p}\mathrm{O}}_2$in deoxygenated blood is$40\mathrm{ }\mathrm{m}\mathrm{m}\mathrm{ }\mathrm{H}\mathrm{g}$and${\mathrm{p}\mathrm{C}\mathrm{O}}_2$in oxygenated blood is$40\mathrm{ }\mathrm{m}\mathrm{m}\mathrm{ }\mathrm{H}\mathrm{g}$.

About 20-25% of carbon dioxide is carried by haemoglobin as carbaminohaemoglobin and solubility of carbon dioxide is 20-25 times higher than that of oxygen.

High${\mathrm{p}\mathrm{C}\mathrm{O}}_2$is seen at the tissues which causes the shift of Oxygen dissociation curve to the right. High pH means low H+ which is seen near the alveoli. This causes the shift of oxygen dissociation curve to the left.