Pulmonary Physiology, Pulmonary Circulation, Dr. D. Penney




Figure 6.01. Pulmonary vs. systemic circulation pressures (mmHg).

Figure 6.01 and Table 6.01 (preceding page) indicate that, in contrast to the systemic circulation, the pulmonary circulation is a low pressure, low resistance, high compliance system.


Both circulations have the same blood flow value since they are in series, but pulmonary vessels are wider and do not show the thick muscular coats as do systemic vessels.

The pulmonary system serves only the lung. Thus, pulmonary vascular resistance (PVR) is much lower than its systemic (SVR) counterpart.


This diagram shows the virtual matching of blood flow (FLOWS) and air flow (VOLUMES) within the normal lung.



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