Explain the process of breathing.(class 10 cbse 5 marks)
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Answer:
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Explanation:
The human respiratory system begins from nose cavities called nostrils. The air from cavity enters into the pharynx and then into the trachea (or wind pipe). The trachea runs down the neck and divides into two tubes called bronchi. Each bronchi is connected to a lung. In the lungs each bronchi divides into a large number of thin tubes called bronchioles. The bronchioles have a tiny air sac at their ends called alveoli. It is in the alveoli where exchange of gases takes place.
Mexhanism of Breathing
When we breathe in air, the diaphragm contracts which results in the increase in volume of chest cavity. Due to this expansion of chest cavity, the air pressure in the lungs decreases. Thus, air from outside rushes into the lungs through nostrils, trachea and bronchi. Therefore, air sacs of lungs get filled with air when we breathe in. The exchange of gases between alveoli and blood takes place by the process of diffusion.
Now, the air present in air sacs of the lungs is rich in C02. When we breathe out air, the diaphragm relaxes which results in the decrease in volume of chest cavity. This contraction pushes the air from the lungs into the trachea, nostrils and then out of the body into air. Breathing in air is called inhalation and breathing out air is called exhalation.
Mechanism of gaseous exchange during respiration: The oxygen is carried by blood to all the parts of the body. As the blood passes through the tissues of the body, the oxygen from the blood diffuses into the cell, whereas the C02 which is produced during respiration diffuses into the blood and is carried to the lungs.
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Explanation:
Breathing is a procces of inhaled and exhaled air . In inhaled air contains carbon dioxide, oxygen, Argon . When we inhaled air it go through nose to lungs through treachea which present in neck . Inhaled air from treachea goes to lungs and which red blood cell present in lungs which carry oxygen.