Bio 118 Special Study Test 2: Page 4
- TURBULENCE – flow is not uni-directional; we have Laminar Flows which are parallel flow lines =>, or turbulence caused by obstructions; if blood gets too watery, it increases the chance of turbulent flow
- ?; blood pressure declines away from the heart as a result of friction between the blood and the vessel walls; arteries are typically way thicker than veins and help to dampen the oscillation for even flow through the capillaries
- systolic pressure is our blood pressure while pumping; diastolic is our blood pressure at rest; we maintain 80 mm/Hg during diastole because arteries have lots of elastic tissue that will snap back (elastic recoil or elastic rebound)- this propels blood forward during diastole when the semilunar valves are closed
- see above; elastic rebound is greatest near the heart and drops in succeeding arterial sections- by the time blood reaches a precapillary sphincter, there are no pressure oscillations and the blood pressure remains steady
- hydrostatic pressure from the arterial end is low, but still pushes enough to move fluid through the capillary; colloid osmotic pressure moves water across the capillary walls; because capillary pressure higher at the arterial end and COP is constant, water tends to move out at the arterial end and in at the venous end; capillary and COP are equal right in the middle (see 396)
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