write the process of breathing in human beings
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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.
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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ᴛʜᴇ ᴘʀᴏᴄᴇss ᴏғ ʙʀᴇᴀᴛʜɪɴɢ (ʀᴇsᴘɪʀᴀᴛɪᴏɴ) ɪs ᴅɪᴠɪᴅᴇᴅ ɪɴᴛᴏ ᴛᴡᴏ ᴅɪsᴛɪɴᴄᴛ ᴘʜᴀsᴇs, ɪɴsᴘɪʀᴀᴛɪᴏɴ (ɪɴʜᴀʟᴀᴛɪᴏɴ) ᴀɴᴅ ᴇxᴘɪʀᴀᴛɪᴏɴ (ᴇxʜᴀʟᴀᴛɪᴏɴ). ᴅᴜʀɪɴɢ ɪɴsᴘɪʀᴀᴛɪᴏɴ, ᴛʜᴇ ᴅɪᴀᴘʜʀᴀɢᴍ ᴄᴏɴᴛʀᴀᴄᴛs ᴀɴᴅ ᴘᴜʟʟs ᴅᴏᴡɴᴡᴀʀᴅ ᴡʜɪʟᴇ ᴛʜᴇ ᴍᴜsᴄʟᴇs ʙᴇᴛᴡᴇᴇɴ ᴛʜᴇ ʀɪʙs ᴄᴏɴᴛʀᴀᴄᴛ ᴀɴᴅ ᴘᴜʟʟ ᴜᴘᴡᴀʀᴅ.
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