Answer:
Common features
between all the respiratory organs are:
(i) All the respiratory organs have large surface areas to
get enough oxygen.
(ii) All the respiratory organs are thin-walled for easy
diffusion of gases and substances.
(iii) 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:
(i) The blood reaching the tissues has higher concentration
of oxygen than in the cells so it gets diffused into the cells.
(ii) 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.
(iii)
The blood with takes this gas to the lungs, from where it is expelled out
during exhalation.
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