Term
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Definition
| Actual volume of blood flowing through a vessel, an organ, or the entire circulation in a given period: |
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Term
| How is blood flow measured? |
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Definition
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Term
| Considering the entire vascular system, blood flow is equivalent to ___________ |
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Definition
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Term
Blood pressure Define?
Expressed as? Normal Level? |
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Definition
| Force per unit are exerted on the wall of a blood vessel by its contained blood. mmHg (millimeters of mercury) 120/70 |
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Term
| Provides the driving force that keeps blood moving? |
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Definition
Differences in Blood pressure.
Blood flows form high pressure to low |
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Term
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Definition
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Term
| Laminar Flow/Peripheral Resistance |
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Definition
| Measure of the amount of friction blood encounters |
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Term
3 Sources of blood flow resistance
What is the most important* |
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Definition
Blood flow viscosity
Blood vessel length
*Blood vessel diameter* |
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Term
| In large vessels there will be more/less resistace? |
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Definition
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Term
| How is blood vessel length related to blood flow resnistance? |
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Definition
| The longer the vessel, the greater the resistance |
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Term
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Definition
| Fluid flow resistance/stickiness of blood. 4.5 to 5.5 |
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Term
| What is the formula that determines blood flow at a given diameter |
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Definition
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Term
| T/F Changes in vessel diameter are frequent and significantly alter peripheral resistance. |
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Definition
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Term
| What do Fatty plaque build cause |
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Definition
Atherosclerosis
Turbulent blood flow
Dramatic increase in resistance |
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Term
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Definition
| Any proliferative (great increase) and degenerative changes leading to decreased elasticity of arteries. |
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Term
| If resistance increases, blood flow will (increase or Decrease)? |
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Definition
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Term
| If blood pressure increases blood flow (increases, decreases) |
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Definition
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Term
| What is more important in in fluencing local blood pressure? |
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Definition
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Term
| Where does the steepest change in blood pressure occur? |
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Definition
the arterioles
from about 95 down to 38 |
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Term
Where is systemic pressure highest?
What is the pressure in the right atrium? |
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Definition
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Term
| What is pulsatile and where does it occur? |
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Definition
| BP rises and falls. Occurs in elastic arteries near the heart. |
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Term
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Definition
| Pressure exerted on arterial walls during ventricular contraction 120 mmHg |
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Term
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Definition
| lowest level of arterial pressure during ventricular cycle 75mmHg |
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Term
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Definition
| the difference between systolic and diastolic pressure 120-75=45mmHg |
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Term
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Definition
| pressure that propels the blood to tissues MAP=diastolic+ 1/3 pulse pressue. ie. 75+45/3=90mmHg |
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Term
| Capillary BP range __-__ mmHg |
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Definition
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Term
| Venous Blood Pressure is changing or steady? |
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Definition
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Term
| How do you tell the difference if a vein is cut vrs an artery |
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Definition
A cut vein has EVEN blood flow
A lacerated artery flows in spurts |
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Term
| T/F Venous BP alone is sufficient enough to promote adequate blood return? |
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Definition
| FALSE it is to low, and requires the aid of respiratory pump, a muscular pump and valves. |
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Term
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Definition
| pressure changes created during breathing suck blood toward the heart by squeezing local veins |
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Term
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Definition
contraction of skeletal muscles "milk" blood toward the heart.
Prevent backflow during venous return. |
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Term
| 1 way venous valves function |
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Definition
| ensure blood moves only toward the heart. |
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