Breathing and Exchange of Gases Class 11 Notes CBSE Biology Chapter 17
1. BREATHING –> Process of exchange of O2 from the atmosphere with CO2 produced by the cells is called breathing, commonly known as respiration. Breathing and exchange of gases ncert pdf 2. Respiration takes place in 3 steps- ●Pulmonary ventilation –> exchange of air between atmosphere and lungs. ●External/pulmonary respiration –>exchange of gases between air […]