*Respiratory system is derived from endoderm in origin.
*Nasopharynx is lined by pseudo stratified ciliated columnar epithelium.
*Alveoli is the structural and functional unit of respiratory system.
*Space between two long is called media sternum where the heart is located.
*all pulmonary volumes and kept capacities are over 20 to 25% less in females than male.
*Tidal volume is 500 ml Dead space cooling is 150 ml.
*residual volume is amount of air that remains in lungs even after post full expiration and cannot be expelled out.
*total lung capacity is maximum of air that lung can hold it is calculated as the sum of vC and RV. total lung capacity is 6000 ml.
*battery capacity is amount of air that can be explained by forceful expiration after forceful expiration it is calculated as the sum of IRV,ERV and TV.
*One molecule of HB can carry four oxygen molecules.
*effect of carbon dioxide concentration on dissociation of oxyhaemoglobin is bohr's effect.
*Carbonic anhydrase is required for carbon dioxide transport as it helps in the formation of carbonic acid from carbon dioxide and water.
*Carbonic anhydrase is the fastest enzyme in the world of enzyme.