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In alveoli of the lungs, the air at the site of gas exchange, is separated from the blood by
- a)alveolar epithelium only [1997]
- b)alveolar epithelium and capillary endothelium
- c)alveolar epithelium, capillary endothelium and tunica adventitia
- d)alveolar epithelium, capillary endothelium, a thin layer of tunica media and tunica adventitia
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
In alveoli of the lungs, the air at the site of gas exchange, is separ...
Alveoli are the site of the respiratory exchange of gases. Oxygen from the alveolar air diffuses through the alveolar epithelium and the capillary endothelium into the capillary blood and carbon dioxide diffuses in the opposite direction.
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In alveoli of the lungs, the air at the site of gas exchange, is separ...
Explanation:
Gas exchange occurs in the alveoli of the lungs, where the oxygen from inhaled air is taken up by blood and carbon dioxide is removed from the blood. The alveolar wall is composed of alveolar epithelium, and it is separated from the blood by the capillary endothelium. The process of gas exchange occurs through simple diffusion across these two thin layers.
The correct answer is option B, which states that the air at the site of gas exchange in the alveoli is separated from the blood by both alveolar epithelium and capillary endothelium. This is because both these layers are involved in the process of gas exchange.
The alveolar epithelium is a thin layer of cells that lines the alveoli. It is composed of two types of cells - type I and type II cells. Type I cells are thin, flat cells that make up the majority of the alveolar wall and are involved in gas exchange. Type II cells secrete a fluid called surfactant, which helps to reduce surface tension in the alveoli and prevent their collapse.
The capillary endothelium is a layer of cells that lines the walls of the capillaries. It is also a thin layer and is in close proximity to the alveolar epithelium. Oxygen and carbon dioxide diffuse across these two layers by simple diffusion, driven by concentration gradients.
In conclusion, the air at the site of gas exchange in the alveoli is separated from the blood by both alveolar epithelium and capillary endothelium, and both these layers play a crucial role in the process of gas exchange.
Gas exchange occurs in the alveoli of the lungs, where the oxygen from inhaled air is taken up by blood and carbon dioxide is removed from the blood. The alveolar wall is composed of alveolar epithelium, and it is separated from the blood by the capillary endothelium. The process of gas exchange occurs through simple diffusion across these two thin layers.
The correct answer is option B, which states that the air at the site of gas exchange in the alveoli is separated from the blood by both alveolar epithelium and capillary endothelium. This is because both these layers are involved in the process of gas exchange.
The alveolar epithelium is a thin layer of cells that lines the alveoli. It is composed of two types of cells - type I and type II cells. Type I cells are thin, flat cells that make up the majority of the alveolar wall and are involved in gas exchange. Type II cells secrete a fluid called surfactant, which helps to reduce surface tension in the alveoli and prevent their collapse.
The capillary endothelium is a layer of cells that lines the walls of the capillaries. It is also a thin layer and is in close proximity to the alveolar epithelium. Oxygen and carbon dioxide diffuse across these two layers by simple diffusion, driven by concentration gradients.
In conclusion, the air at the site of gas exchange in the alveoli is separated from the blood by both alveolar epithelium and capillary endothelium, and both these layers play a crucial role in the process of gas exchange.
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In alveoli of the lungs, the air at the site of gas exchange, is separ...
Alveoli are the site of the respiratory exchange of gases. Oxygen from the alveolar air diffuses through the alveolar epithelium and the capillary endothelium into the capillary blood and carbon dioxide diffuses in the opposite direction.
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In alveoli of the lungs, the air at the site of gas exchange, is separated from the blood bya)alveolar epithelium only [1997]b)alveolar epithelium and capillary endotheliumc)alveolar epithelium, capillary endothelium and tunica adventitiad)alveolar epithelium, capillary endothelium, a thin layer of tunica media and tunica adventitiaCorrect answer is option 'B'. Can you explain this answer?
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