Abstract
The circulatory system is a closed loop passing the heart twice. The blood, returned from the body, enters the right ventricle via the right atrium. At a relatively low pressure (approx. 30 mmHg) blood is pumped into the lungs at a rate in the order of 5 liters per minute. The blood returning from the lungs is collected in the left atrium, from where it flows into the left ventricle during each diastolic phase. The left ventricle is a powerful pump having a wall significantly thicker than the right ventricle. The latter property enables the left ventricle to generate a relatively high pressure (approx. 130 mmHg) at the same flow rate as the right ventricle. After passing the aortic valve, the blood enters the arterial system. The compliance of this system enables uptake of the volume, ejected by the left ventricle during the relatively short period of systole. Because in arteries inertial forces overrule viscous forces, after each heartbeat a pressure-flow wave is guided down to the smallest arteries. At the level of arterioles (diameters 15–100 μm) viscous forces exceed inertial forces, causing attenuation of the pressure wave. At this level flow regulation takes pace by controlling vessel diameter.
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© 1987 Martinus Nijhoff Publishers, Dordrecht
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Arts, T., Reneman, R.S. (1987). Cardiovascular Biomechanics. In: Bergmann, G., Kölbel, R., Rohlmann, A. (eds) Biomechanics: Basic and Applied Research. Developments in Biomechanics, vol 3. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3355-2_6
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DOI: https://doi.org/10.1007/978-94-009-3355-2_6
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