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