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8 Cards in this Set
- Front
- Back
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Clinically significant increases in viscosity are seen in diseases in which plasma proteins such as immunoglobulins are markedly elevated and in diseases such as hereditary spherocytosis, in which RBC are abnormally rigid. TRUE/FALSE
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TRUE.
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What is critical closing pressure?
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It is the pressure at which flow ceases.
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What is the law of LaPlace?
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It is surprising that structures as thin walled and delicate as the capillaries are not more prone to rupture. This is due to their small diameter.
This law states that tension in the wall of a cylinder(T) is equal to the product of the transmural pressure(P) and the radius(r) divided by wall thickness; T= Pr/W |
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What is the Windkessel effect?
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Because vessels are elastic, forward flow is continuous because of the recoil during diastole of the vessel walls that have been stretched during systole. Windkessel is the recoil effect.
In the proximal portion of the aorta during systole, velocity is approximated at 120cm/sec. |
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The arterial blood pressure is routinely measured by the auscultatory method. TRUE/FALSE
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TRUE. The inflatable cuff is called a Riva-Ricci cuff. Sounds heard after lowering cuff pressure about the brachial artery are Korotkoff sounds.
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The sounds of Korotkoff are caused by turbulent sounds in the brachial artery. TRUE/FALSE
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TRUE. When the artery is narrowed the velocity of flow through the constriction exceeds the critical velocity.
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When does peak of systole occur while measuring blood pressure?
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At cuff pressures just below systolic pressure flow through the artery occurs only at the peak of systole.
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The cuff must be at heart level to obtain a pressure that is un influenced by gravity. TRUE/FALSE
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TRUE.
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