Respiratory is the breakdown of absorbed food with the help of oxygen. During this process, carbon dioxide (CO2) and water (H2O)are released as waste and a lot of energy is produced. This energy is made available to the cells of the body.
Food + oxygen g carbon dioxide + water + energy
C6H12O6 + 6O2 g 6CO2 + 6H2O + energy
In this process, glucose is oxidized slowly in the cells and energy is released. The energy is released in the form of ATP (Adenosine triphosphate), This a complex compound. This process of cellular respiration takes place in mitochondria of every cell of the body. Since every cell needs energy to work and this process takes place within cells of the body, it is also called internal respiration or tissue respiration. As, it occurs in the presence of oxygen, it is also called aerobic respiration.
The various respiratory organs are:
1. Nostrils
2. Nasal cavity
3. pharynx
4. trachea
5. bronchi
6. lungs
1. Nostrils:
2. Nasal cavity:
3. Pharynx:
4. Trachea:
The trachea has two main functions:
a) The cartilaginous rings of the trachea help in
keeping air passage all the time.
b) The mucus lining catches the dust particles present
in the inhealed air.
Air entering trachea first passes through larynx or voice box. It helps in producing sound.
5. Bronchi:
6. Lungs:
The alveoli are the structures in the lungs where the exchange of gases (oxygen and dioxide0 takes place.
We breath in air rich in oxygen. The air goes in through nostrils to a pipe called windpipe or trachea. The pipe divides into two branches called bronchi which finally enter the lungs. From the lungs, oxygen enters the blood.
Carbon-dioxide and water formed in respiration are released into lungs. These are removed from the lungs with the air we breathe out.
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