What is the pathway taken by air in the respiratory system?illustrate with a labelled diagram
Answers
Air enters the nostrils passes through the nasopharynx, the oral pharynx through the glottis into the trachea into the right and left bronchi, which branches and rebranches into bronchioles, each of which terminates in a cluster of alveoli Only in the alveoli does actual gas exchange takes place. There are some 300 million alveoli in two adult lungs. These provide a surface area of some 160 m2 (almost equal to the singles area of a tennis court and 80 times the area of our skin!).
Answer :-
The pathway taken by air in the respiratory system :-
Nostrils —› Nasal Cavity —› Pharynx —› Larynx —› Trachea —› Bronchus—› Bronchioles —› Alveoli —› Blood
1. Air enters the body through the nostrils.
2. Air is filtered by a hair in the nasal cavities.
3. Nasal cavities lead into the trachea is also called the wind pipe.
4. Trachea after entering into lungs divides into 2 bronchi one leading to each lung.
5. The bronchi further divide into smaller and smaller branches called bronchioles.
6. Bronchioles finally terminate in clusters of air sacs called alveoli in lungs which are very small and numerous.
7. Gaseous exchange takes place here as blood capillaries take up oxygen and expel carbon dioxide here.
8. Blood carries oxygen to each and every cell of the body. The whole passage from nostrils to alveoli is moist and warm.