Question

Short note human respiratory system

Answer 1

Hi 

The air , passes through the nostrils.
The air that is passing is filtered by the fine hairs , which lines the passage.
Also , mucus helps in lining the passage , in the process involved.
From here , air passes through the throat and then into the lungs 
In the throat , rings of cartilage are present , which ensures that the air passage does not collapse.

In the lungs , the passage is divided into very smaller tubes , that terminate into balloon like structures known as alveoli.

Alveoli is a surface that helps in the exchange of gases.

Extensive network of blood vessels is present in the walls of alveoli

When we breathe in , our ribs are lifted and diaphragm is flattened.
As a result , chest cavity becomes larger in size.

Therefore ,the air is sucked into the lungs , expanding the alveoli 

Carbon dioxide are released into the alveoli by blood.

Oxygen in the alveolar air is taken by alveolar blood vessels , and is transported to all the cells in the body.

Answer 2

Explanation:

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