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| Description: Blood flow is the volume of blood that flows through a tissue in a given period of time Blood flow is inversely related to the cross-sectional area of blood vessels 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: 193 Filesize: 382.7kB Height: 594 Width: 665 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40624 |