Emphysema is a chronic lung disease. It is often caused by exposure to toxic che
ID: 3480232 • Letter: E
Question
Emphysema is a chronic lung disease. It is often caused by exposure to toxic chemicals or long-term exposure to tobacco smoke. Emphysema is characterized by loss of elasticity of the lung tissue; destruction of structures supporting the alveoli; and destruction of capillaries feeding the alveoli. Given this information, a tobacco smoker may develop difficulty... O with inspiration, since the lungs' compliance is abnormally high ..with inspiration, since the lungs' elastic recoil is increased ...with expiration, since the lungs' elastic recoil is abnormally low .with expiration, since the lungs' compliance is decreased ..with inspiration, since alveolar supporting structures are destroyedExplanation / Answer
1. Emphysema is a disease in which the alvioli are get damaged which leads to shortness of breath.
Answer :..... With inspiration, since alvioli supporting structure are destroyed.
2. Intra pleural pressure and alviolar pressure are relative to each other. During inspiration both would be negative (below atmospheric pressure). So the air will pass from the high pressure at the mouth to the low pressure at the lungs. During expiration both would be positive (higher than the atmospheric pressure). As a result the air will move out of the lungs.
Ans: negative during inspiration and positive during expiration.
3. Most of the carbon dioxide in the venous blood is carried as Ans: bicarbonate ion.
4. Ans: Extracellular elastins are present in the connective tissues of the lungs which help them for the elastic recoil.
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