Question

human respiratory system with diagram.

Answer 1

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THE HUMAN RESPIRATORY SYSTEM-

Main Organs-
The human respiratory system consists of the following organs:-
1. Nostrils
2. Nasal Passage/ Nasal Cavity
3. Rings of cartilage
4. Trachea
5. Bronchi
6. Bronchioles
7. Lungs
8. Diaphragm

Nostrils-Air is taken in the body through the nostrils. Nostrils are present in the nose.

Nasal Passage- The air then goes intk the nasal passage or nasal cavity.

Trachea- From the nasal passage, air enters into pharynx and then goes into the wind pipe or trachea. Rings of cartilage are present here, which ensure that the air-passage does not collapse.

Bronchi- The trachea runs down the neck and divides into two smaller tubes called bronchi. The two bronchi are connected to the lungs.

Lungs- The lungs lie in the chest cavity or the thoracic cavity which is saparated from the abdominal cavity by a muscular partition called diaphragm. The lungs are covered by two thin membranes called pleura. The lungs are enclosed in a rib cage made of bone called ribs.
Each bronchus (singular of bronchi) divides in the lungs to form a large number of smaller tubes called bronchioles.
The bronchioles finally terminate into balloon-like structures called alveoli. The walls of the alveoli are thin and contain an contain an extensive network of blood vessels.

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Answer 2

https://hi-static.z-dn.net/files/d94/91c946cdb74234d1c879f9b4c3cee446.jpg