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  Biological Importance of Surface Tension

Biological Importance

1. Emulsification of fats by bile salts:

In the duodenum Bile salts lower the surface tension of the fat droplets that aids in digestion and absorption of lipids.

2. Surface tension of plasma:

The plasma’s surface tension is 70 dynes/cm that is slightly lower as compared that of water.

3. Hay’s test for bile salts:

The standard of surface tension is employed to test the existence of bile salts in urine. While fine sulphur powder is sprinkled on urine consisting of bile salts (like in jaundice), it sinks because of the surface tension lowering effect of bile salts. If there are no bile salts in urine like in normal individuals, it floats.

4. Dipalmitoyl lecithin:

It is a surfactant which is secreted through the lung alveoli that reduces the surface tension and avoids the collapse of lung alveoli during expiration. Specific pre-mature infants comprise low levels of this surfactant leading to acute respiratory distress.

 

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