Observe the given model that can be used to demonstrate the breathing mechanism in human beings.


Name the structures which can be compared to:


(i) Lungs (ii) Diaphragm


(iii) Trachea (iv) Nostrils (Nose)

1. Lungs – Balloon because air will fill the balloon in the same manner as air from environment passes through nostrils to fill the lungs.


2. Diaphragm – Rubber sheet which is present at the bottom of the jar. It will show similar movement like diaphragm when air will enter the balloon or jar.


3. Trachea – the Plastic tube which is inserted in a balloon. It forms the pathway for air to enter the balloon just like trachea.


4. Nostrils – Opening of the tube. Air will enter through this opening.


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