The diagram below shows a model that can be used to demonstrate how the lung inflates.
Which part of the human thorax is represented by the
(i) Balloon
(ii) Rubber sheet
(iii) Tube A
(iv) Tube B
tube A
bung
tube B
balloon
bell jar
rubber sheet
(i) Lungs; (ii) Diaphragm; (iii) Trachea (iv) Bronchi
(i) Brond
nchi
; (i) Diaphragm; (iii) Trachea (iv) Lungs
O (1) Lungs; (ii) Trachea; (iii) Diaphragm (iv) Bronchi
O (1) Trachea; (ii) Diaphragm; (iii) Lungs (iv) Bronchi
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Answer:
Option (a) (i) Lungs (ii) Diaphragm (iii) Trachea
(iv) Bronchi. is the correct answer.
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The part of the human thorax represented are as follows: (i) Lungs; (ii) Diaphragm; (iii) Trachea (iv) Bronchi
(i) Balloon - Lungs
- The movement of the balloons in the given model matches that with the movement of lungs during breathing.
- During inhaling, the air enters the lungs. Likewise, the balloon inflates when air is filled in it.
- During exhaling, the air leaves the lungs. Likewise, the balloon deflates when air is thrown out.
(ii) Rubber sheet - Diaphragm
- When lungs are filled in with the air, the diaphragm expands to make space for this expansion.
- Here also, the inflating of the balloon is facilitated by the rubber sheet, which makes space for the inflated balloons.
(iii) Tube A - Trachea
- The air is taken to the lungs with the help of a pipe-like structure called the trachea.
- Here, pipe A represents the trachea.
(iv) Tube B - Bronchi
- Trachea branches into two bronchi to facilitate the gaseous exchange in the two lungs.
- One bronchus reaches each lung.
- Thus, pipe B represents bronchi.
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