As you progress through the numerous arterial blood pressures of her ways and gradually falls in the capillaries is reduced to 10 - 15 millimeters of mercury. And in order to raise the blood through the veins, say, the lower extremities back to the heart, the pressure required 60 and even 100 (depending on the growth of human) mm Hg. It is here that cannot do without extracardiac circulation mechanisms, such as the diaphragm, which separates the chest cavity from the abdominal.
From The Truth about Six Packs Abs Review Program by Mike Geary, during inhalation it is lowered and the volume of the thoracic cavity is increased, the pressure therein drops and rises in the abdominal cavity. As a result of venous blood enters the abdominal thoracic vein. And during exhalation diaphragm rises, and then increases the amount of abdominal pressure in the fall, and the blood from the veins of the lower extremities rises into the veins of the abdominal cavity to the inhalation strive venous vessels in the chest cavity and then reach the right atrium of the heart.
Until recently, the skeletal muscles to Noncardiac mechanisms circulation did not belong. They were considered by consumers only blood. Strengthening same perfusion of skeletal muscle in 40 - 60 times during physical work (the so-called working hyperemia) was seen as an additional burden on the heart. What naturally follows that the protective regime for the heart muscle is at rest. But even decreased motor activity, not to mention a complete rest, turned negative consequences not only for health, but also the patient's heart.
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