Hemodynamics. Dr. Amel Eassawi. OBJECTIVES. The student should be able to : Know and understand the structure and basic function of different parts of the vascular system. Describe laminar and turbulent blood flow . Explain factors affecting peripheral resistance . Hemodynamics.
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Distribution of Cardiac Output:
It is the resistance offered by the blood vessels to the flow of the blood.
Factors affecting the resistance to blood flow:
1- Directly proportional to the length of the blood vessel.
The greater the length of the B.V. the greater will be the resistance.
2- Directly proportional to the viscosity of the blood.
The greater the viscosity of the blood the greater will be the resistance.
3- Inversely proportional to fourth power of the radius of the blood vessel.
1.Viscosity of Blood
2. Length of a Blood Vessel
3.Radius of the vessel
Major Resistance vessels:
Average pressure driving blood forward into tissues throughout cardiac cycle
Mechanisms involved in adjusting arteriolar resistance
Arteriolar Vasoconstriction and Vasodilation
Veins return blood to the heart
1.Connect arteries & veins
2. Site where gasses, nutrients & wastes are exchanged between blood and tissues