Human Respiratory System - मानव श्वसन तंत्र, - Biology - ICSE/CBSE Class 9 & 10 | Umrah mam |

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Human Respiratory System is very important topic to understand the basic of Biology. It is soo important to all classes.
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The human respiratory system is a complex network of organs and tissues that work together to facilitate the exchange of oxygen and carbon dioxide between the body and the environment. 1 2 It's responsible for breathing, which involves inhaling oxygen-rich air and exhaling carbon dioxide-rich air

Nose and Mouth: These are the entry points for air into the respiratory system. The nose warms, humidifies, and filters the air before it reaches the lungs.  
Pharynx (Throat): This is the passageway for both air and food. It connects the nasal and oral cavities to the larynx.  
Larynx (Voice Box): This contains the vocal cords, which vibrate to produce sound. It also prevents food and liquids from entering the trachea.  
Trachea (Windpipe): This is a tube that carries air from the larynx to the lungs.

It's lined with cilia, which help to trap and remove dust and other particles from the air.
Bronchi: The trachea branches into two bronchi, one leading to each lung. The bronchi further divide into smaller and smaller tubes called bronchioles.  
Lungs: These are the primary organs of the respiratory system. They are spongy, air-filled organs located in the chest cavity. The lungs are responsible for gas exchange, where oxygen is absorbed into the bloodstream and carbon dioxide is released from the bloodstream.  
Alveoli: These are tiny air sacs located at the ends of the bronchioles. They are surrounded by capillaries, where the exchange of gases occurs.  
Diaphragm: This is a dome-shaped muscle that separates the chest cavity from the abdominal cavity. It plays a crucial role in breathing by contracting and relaxing.
Process of Respiration:

Inhalation: The diaphragm contracts, pulling downward and expanding the chest cavity. This creates a negative pressure in the lungs, causing air to rush in through the nose or mouth.  
Exhalation: The diaphragm relaxes, reducing the volume of the chest cavity.

This forces air out of the lungs.

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