The alveoli in the lungs are always moist to facilitate efficient gas exchange. This moisture helps dissolve oxygen and carbon dioxide, allowing them to diffuse more easily across the thin alveolar membrane. Additionally, the presence of a liquid film reduces surface tension, preventing the alveoli from collapsing and ensuring they can expand fully with each breath. Overall, moisture is crucial for maintaining optimal respiratory function.
Gas exchange surfaces like the alveoli need to be moist because gases, such as oxygen and carbon dioxide, dissolve in water. The thin layer of moisture in the alveoli allows for efficient exchange of gases between the air in the lungs and the bloodstream. This ensures that oxygen can be absorbed into the blood and carbon dioxide can be released from the blood.
Alveoli does not collapse because lungs always have a residual volume which prevents the alveoli to collapse.
The key is surface area. The indentations make the surface area of the lungs inner surface to be many times the surface area of a similarly sized sphere. The greater surface area means that the diffusion distance from the air cavity in the lung to the vascular part of the lung is very short.
Water is lost from the gas exchange surface of terrestrial organisms because gases must be exchanged with air. Terrestrial organisms have a high water potential, therefore when the gas exchange occurs water will be lost.
Always.
no
In the lungs, carbon dioxide is concentrated more in the blood. The alveoli keeps the carbon dioxide at a lower level than in the blood.
Exchange rates are always fluctuating.
Exchange rates are always fluctuating.
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Of course not. How could that possibly be?
sometime but most of them are not