. What are the common features between all the respiratory organs? Explain the mechanism of gaseous exchange between tissues and blood.
Common features between all the respiratory organs are:
- All the respiratory organs have large surface areas to get enough oxygen.
- All the respiratory organs are thin-walled for easy diffusion of gases and substances.
- All the respiratory organs (like skin, lungs, gills) have a rich supply of blood for transporting respiratory gases.
The mechanism of gaseous exchange between tissues and blood is as follows:
- The blood reaching the tissues has higher concentration of oxygen than in the cells so it gets diffused into the cells.
- The carbon dioxide, which is formed in the cells, gets accumulated in higher concentration as compared in the blood, so it easily diffuses into the blood.
- The blood with CO2 takes this gas to the lungs, from where it is expelled out during exhalation.