Classic

Blood Flow

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by Tehescmarts
Last updated 5 years ago

Discipline:
Science

Blood Flow

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Heart Contraction

Animation and Quiz

Caution!! Graphic! 10 min

22min Circulation

Artery Radius

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Cardiac Output

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2 min

Blood Flow

1. Pressure Gradient--high at aorta; low at vena cavae 2. Heart generates pressure 3. Vessels conduct and influence flow by constricting or dilating 4. The autonomic nervous system changes pressure, flow and volume 5. Input from brain centers and sensory receptors to the cardiovascular center in the medulla oblongata. 6. Sympathetic nerves increase the heart rate and stroke volume. 7. Parasympathetic nerves decrease heart rate. 8. Systole is SQUEEZE; diastole is DREAMY relaxing fill. 9. Normal blood pressure is about 120/80 mm Hg. 10. Cardiac Output is affected by Preload, Contraction, and Afterload. 11. The more the muscle is stretched, the harder it will contract--Starling's Law. 12. Exercise stimulates sympathetic system to increase venous return, stretch the heart, and increases CO2. 13. Smaller the diameter, the more resistance. 14. Veins have less pressure and so blood return utilizes valves, skeletal pump, and respiratory pump. 15. Blood Pressure = Flow X Resistance 16. Longer vessels have more resistance such as in obese people. 17. Viscous blood increases resistance.

Causes low blood flow: 1. Damage to vascular system. 2.Narrowing of arteries. 3. Obstructed flow due to muscle thickening 4. Sugar in blood-Hi viscosity. 5. Low amount of blood

Causes high blood flow: 1. Some drugs 2. Increase in cardiac output 3. Dilation of skeletal vessels 4. Low viscosity

Blood Flow =Blood Pressure/Resistance Longer vessel:more resistance Higher viscosity: more resistance Smaller the diameter of vessel:more resistance

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