Respiration in Humans; Human beings has a well defined respiratory system Air that we breathe in enters through the nostrils which are line by hairs to filter the air that enters, Nostrils are also lined with mucous which is sticky in nature and absorbs any dust and other particles that enters, After that air passes through trachea. Trachea has rings of cartilage which prevents from collapsing if air enters through great force.
Trachea bifurcate after descending a little and forms two bronchi . Bronchi then enters the Lungs.and inside the lungs it branches to form fine network like structure called bronchiloes. Human being posses a pair of lungs. Functional unit of lungs is called as Alvulus ( pl.Alveoli). It is a sac or balloon like structure. Alveoli is surrounded by blood capillaries and helps in the exchange of gasses.
Process of respiration in human can be divided into two main parts - Inhalation and Exhalation or Inspiration and Expiration. In inhalation or inspiration we take oxygen from the mixture of gases and in exhalation or expiration we give out carbondioxide as waste gas from our body. Different organs of our body like ribs, diaphragm, intercostal muscles etc.plays a great role in the process of respiration.
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