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Answers
Answer:
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Explanation:
A.The nose is built with a specific purpose: to support our respiratory system (the primary purpose of the mouth, on the other hand, is to start the digestive process). The nostrils, hair and nasal passageways are designed to assist in filtering allergens and foreign bodies from entering the lungs. The nose also adds moisture and warmth to inhaled air for smoother entry to the lungs.Nasal breathing, as opposed to mouth breathing, has another important advantage, especially for effective and efficient exercise: It can allow for more oxygen to get to active tissues. That is because breathing through the nose releases nitric oxide, which is necessary to increase carbon dioxide (CO2) in the blood, which, in turn, is what releases oxygen. Mouth breathing does not effectively release nitric oxide, which means the cells are not getting as much oxygen as through nasal breathing, which could lead to fatigue and stress.
B.Upon inhalation, the diaphragm contracts and flattens and the chest cavity enlarges. This contraction creates a vacuum, which pulls air into the lungs. Upon exhalation, the diaphragm relaxes and returns to its domelike shape, and air is forced out of the lungs.
Inspired gas...
C.Inspired gas is the gas we take in during breathing which mostly contains oxygen in adequate amount whereas expired gas is the gas we breathe out which is mostly carbon dioxide.Inspired gas is mainly used for the oxidation of food for energy whereas expired gas is the bi product of oxidation and is toxic in nature.
Expired gas..
The expired air differs from inspired air qualitywise in the following aspects:
It contains less oxygen
It contains more water vapour
It contains more carbon dioxide
It is warmer or at the same temperature as that of the body
It may contain some bacteria
D.Pleura is the protective layer around the lungs
Hope these answers helps you