Physiology: Cardiac output, blood flow, and blood pressure

... osmotic pressure • = osmotic pressure exerted by proteins in fluid • Difference between osmotic pressures in & outside of capillaries (oncotic pressure) affects fluid movement • Plasma osmotic pressure. .. on: • Blood volume & venous pressure • Vasoconstriction caused by Symp • Skeletal muscle pumps • Pressure drop during inhalation Fig 14.7 14-15 Venous Return continued • Veins hold most of blood. .. thin walls & stretch easily to accommodate more blood without increased pressure (=higher compliance) • Have only 010 mm Hg pressure Fig 14.6 14-16 Blood Volume • Constitutes small fraction of total