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Alveoli
...  alveoli or the air sacs are the terminal parts of the respiratory system. It is the site of actual gas exchange known as internal respiration. The human body has approximately 300 million alveolus. Each of them performs specifically to allow the oxygen to enter your body and the carbon dioxide to exit. Whenever you inhale, the diameter of the individual alveolus increases to accommodate the  ...

Nose
...  how we taste foods. It also plays a big role in our facial features and can even dictate beauty. More importantly, it is the main gate for breathing or respiration, as the whole process of the respiratory system starts with the nose. The two holes that are found in our nose are called the nostrils. The nostrils are where the air enters the body through inhalation. There is a wall  ...

Trachea
...  bony tube that connects the lungs to the nose and the mouth is called the trachea. It is commonly known as the windpipe and it plays an important role in the respiratory system. It is through the trachea that the air flows into our lungs, which is needed for respiration. It extends downward, coming from the base of the voice box or the larynx. Part of it lies in the neck, and the other part  ...


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