PSL201Y1 Lecture Notes - Lecture 20: Central Venous Pressure, Blood Pressure, Thoracic Cavity
Document Summary
Veins: large diameter but thin walls valves allow unidirectional blood flow: present in peripheral veins and absent from central veins. Venous pressure is important factor in determining how much blood returned to heart lots of pressure in veins, more blood returned to heart. Blood distribution most blood volume is in veins 60% and capillaries lowest with 5% Central venous pressure pressure in the large veins of the thoracic cavity that lead into the heart. Factor that influence central venous pressure and venous return skeletal muscle pump. Hypertension or continuously high blood pressure isn"t good in the long term, but hypotension is an immediate threat to our lives. Extrinsic control of cardiovascular function plays a role in regulation of mean arterial pressure. 3 l of fluid leaks out of capillaries each day where exchange of oxygen and nutrients occur. In systemic circuit, normal map is about 90mmhg normal venous pressure is about 0mmhg.
