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Video Summary:
This video explains mechanism of action of surfactants i.e. how surfactants reduce surface tension. The fundamental concept is very simple. The basic cause of surface tension is downward pull on the surface water molecules. Surfactants molecules are made in such a way that there is no downward pull on them. Also they decrease the downward pull on nearby water molecules. This results in reduced surface tension.

More videos on Respiratory Physiology:
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Functions of Surfactants:    • Functions of Surfactants in Alveoli  
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• What Determines Lung Volume?:    • What Determines Lung Volume?  

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00:00 Introduction
00:15 Structure of Surfactant Molecule
00:47 Surface Tension
01:33 Mechanism of Action of Surfactant

DISCLAIMER: This video is for education purpose only. Although every effort is made to ensure accuracy of material, viewer should refer to the appropriate regulatory body/authorised websites, guidelines and other suitable sources of information as deemed relevant and applicable. In view of possibility of human error or changes in medical science, any person or organization involved in preparation of this work accepts no responsibility for any errors or omissions or results obtained from use of information in this video.