Question

If one hold his breath after expiration for about 30 sec., would there still be occurring any exchange of respiratory gases in the lung during this period? Explain.

Answer 1

Yes, if someone holds his breath after expiration for about 30 sec there would still be occurring exchange of respiratory gases in the lungs during this period because after a normal expiration some amount of air remains in our lungs which we call as residual volume which is 1100-1200 ml. When we uphold our breath the exchange of this residual volume gases will continue in our lungs.