the transmural (distending) pressure because the outside pressure is still zero (atmospheric). Because the veins are highly compliant, such a large increase in transmural pressure is accompanied by an increase in venous volume.

The arteries of the legs undergo exactly the same increases in transmural pressure. However, the increase in their volume is minimal because the compliance of the systemic arterial system is only 1/20th that of the systemic venous system. Standing increases pressure in the arteries and veins of the legs by exactly the same amount, so the added pressure has no influence on the difference in pressure driving blood flow from the arterial to the venous side of the circulation. It only influences the distension of the veins.

Was this article helpful?

0 0
Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

Get My Free Ebook

Post a comment