Q. 2 H4.4( 7 Votes )
Answer the follow
● Taking in and giving out air is called breathing.
● Breathing is done with the help of the respiratory system.
● The respiratory system consists of nose, pharynx, larynx, trachea, bronchi, and lungs.
● Lungs include bronchioles and alveoli.
● The process of breathing:
● Air enters the nasal cavity through the nostrils.
● Dust particles present in the air are prevented from reaching the lungs.
● Air passes to the pharynx, and then into the trachea with the help of epiglottis.
● The trachea is supported by ‘C’ cartilaginous rings which prevent the trachea from collapsing.
● The trachea is divided into two branches called bronchi.
● One bronchus enters the left lung and the other enters the right lung.
● These bronchi are further branched into bronchioles.
● Air sacs are present at the terminals of bronchioles. These are called alveoli.
● Gaseous exchange occurs in the alveoli, gives out carbon dioxide and collects oxygen.
● Oxygenated blood distributes oxygen to the cells.
● Oxygen is used to oxidize food to release energy in the process of cellular Respiration.
● Carbon dioxide that is formed as a by-product during respiration is carried by the blood to the alveoli.
● Carbon dioxide is exhaled out through nostrils.
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