Physiological applications of Laplace Law

The Laplace Law describes the relationship between the pressure required to keep the alveolus open:

P = 2*T/r

For pressure P (dynes/cm2), surface tension T (dynes/cm), and the alveolar radius r (cm)

This means that to stay open, small alveoli require either a lot of pressure or decreased surface tension.

''note that this applies not only to alveoli but also to heart, bladder Ask to explain pressure-volume loop and law of Laplace. Draw pictture!!!!''