In the beginning of the chapter, we stated that the tension on the individual muscle fibers is proportional to the pressure in the ventricular lumen. The relationship between wall tension and luminal pressure for a spheroid is given by the law of LaPlace. When applied where P is the pressure in the lumen and R is the radius of the sphere. In a thick-walled structure like the ventricle, one must divide by the wall thickness as well. The LaPlace relationship not only predicts that tension is proportional to pressure but also to the radius as well. Muscle fibers in the ventricle generate a pressure in the lumen that is in the proportion to their force of
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