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Circulation guyton
Circulation - guyton
Question | Answer |
---|---|
What is distensibily of blood vessels? | All the blood vessels are strechable. |
Most distensibility in? | Veins 8x more distensible then arteries |
Distensiblitiy difference between pulmonary and systemic | The pressure is 1/6 less so the distensibility is 1/6 less |
Vascular distensibility causes? | Less resistence, smooth blood flow. |
A increase in volume in arterial system causes? | drastic pressure change. |
How much blood is filled in the arterial system? | 750ml |
If volume is lowered to 500ml what happens to the pressure? | Dropps to zero. |
Delayed compliance | vessels exposed to increased volume first exibits large increase in pressure but delayed stretch of the vessels walls drive the pressure back down to normal. |
What does effect the pressure? | Stroke volume, total distensibility of hte arterial tree and character of injection |
What happens to the pressure as it travels down the arterial tree and why? | It gets damped because 1, the resistance to blood movement and 2, complinace of vessels. |
What central venus pressure? | It's in the right atrium where all veins flow into. |
What increases the venous return? | 1, increased blood volume. 2, increased peripheral venus pressure. 3, dilatation of arterioles->rapid flow of blood. |
What causes higher pressure in atrium? | (1) Heart failure 2) massive blood transfusion. |
What causes the pressure in the atrium to drop? | 1)excessive pump 2)blood flow to the atrium is depressed. |
Why does large veins offer some resistence to blood flow? | Because of the collapsing vein or because of a compressed vein. |
Which veins in the body does not collapse? | In the sinus veins in the brain. |
What happens to a standing person when the vein gets damage? | Air enters the blood stream and causes a air embolism in the heart. |
Where do we have specific reservoirs? | In spleen, liver, large abdominal veins, venous plexus beneath the skin, heart and the lungs. |
What is the spleens function? | Stores red blood cells, Cleans the body from old cells, bakteria, parasites etc. |