Question 48:
(a) Explain how, the air we breathe in gets cleaned while passing through the nasal passage.
(b) Why do the walls of trachea not collapse when there is less air in it ?
(c) How are oxygen and carbon dioxide exchanged in our body during respiration ?
(d) How are lungs designed in human beings to maximise the exchange of gases ?
Lakhmir Singh Biology Class 10
Answers
A) there are hairs which clean the air entering the nasal passage...
B) rings of cartilage are present which prevent the wall of trachea to collapse when there is no or less air present in trachea..
C) gaseous exchange takes place through diffusion in our body. O2 from alevioli (lungs) is passed into blood vessels surrounding it an co2 from blood is passed to alevioli.
D) lungs have sac like structures called alevioli which are present to provide larger surface area for gaseous exchange between lungs an blood...
Hope it helps you dear!!
(a) The insides of the nose have fine hairs in it which traps the impurities in the air and in the process cleans the gas while it passes through the nasal passage.
(b) The walls of the trachea do not collapse even when there is less air, as it is supported by the rings of cartilage shaped in the alphabet C. This provides the support to the trachea and the latter does not collapse in the lack of air.
(c) The oxygen inhaled through the body gets transferred to every cell and the respiration occurs and then the carbon dioxide from the cells gets transferred through the deoxygenated blood medium to the heart and then the gas is expelled out from the lungs.
(d) The lungs are light and are present with a large number of air chambers through which the gas exchange occurs. They inflate when inhaled and upon exhalation, they deflate.
Learn more about breathing:
Measure the breathing rate of the members of your family and some of your friends. Investigate:
(c) If the breathing rate of children is different from that of adults.
(d) If the breathing rate of males is different from that of females.
If there is a difference in any of these cases, try to find the reason
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Why breathing through the nose is said to be healthier than breathing through the mouth
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