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| Description: Vascular Resistance (R) R is the opposition to blood flow due to friction between blood and the walls of blood vessels The higher the R, the smaller the blood flow R depends on: Size of the blood vessel lumen Blood viscosity Total blood vessel length Venous return, the volume of blood flowing back to the heart through the systemic veins, occurs due to the pressure generated by contractions of the heart’s left ventricle Venous return is assisted by: Valves Respiratory pump Skeletal muscle pump Picture Stats: Views: 209 Filesize: 869.87kB Height: 880 Width: 980 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40621 |