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Questions and Answers
What is the primary function of surface tension in the alveoli?
What is the primary function of surface tension in the alveoli?
- To regulate blood pressure
- To warm the air we breathe
- To resist distension (correct)
- To facilitate the exchange of gases
What is responsible for the surface tension in the alveoli?
What is responsible for the surface tension in the alveoli?
- The repulsive forces between water molecules
- The surface area of the alveoli
- The attractive forces between oxygen molecules
- The attractive forces between water molecules (correct)
What is the direction of the force exerted by surface tension in the alveoli?
What is the direction of the force exerted by surface tension in the alveoli?
- Upward, towards the trachea
- Inward, raising pressure in the alveoli (correct)
- Downward, towards the diaphragm
- Outward, decreasing pressure in the alveoli
What is the result of the lungs secreting and absorbing fluid?
What is the result of the lungs secreting and absorbing fluid?
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What is the purpose of the fluid in the alveoli?
What is the purpose of the fluid in the alveoli?
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Study Notes
Surface Tension in the Lungs
- Surface tension is a force exerted by fluid in the alveoli to resist distension.
- The lungs secrete and absorb fluid, leaving a very thin film of fluid on the surface.
- This thin film of fluid causes surface tension.
- The surface tension is a result of attractive forces between H2O molecules at the surface.
- These attractive forces are directed inward, which raises the pressure in the alveoli.
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