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Quiz 3 Sec 2
Chapter 19 Blood vessels
32
Anatomy
Undergraduate 2
02/10/2010

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Term
Blood flow Define?
Definition
Actual volume of blood flowing through a vessel, an organ, or the entire circulation in a given period:
Term
How is blood flow measured?
Definition
ml per min
Term
Considering the entire vascular system, blood flow is equivalent to ___________
Definition
Cardiac output
Term
Blood pressure Define?
Expressed as? Normal Level?
Definition
Force per unit are exerted on the wall of a blood vessel by its contained blood. mmHg (millimeters of mercury) 120/70
Term
Provides the driving force that keeps blood moving?
Definition
Differences in Blood pressure.
Blood flows form high pressure to low
Term
Resistance to blood flow
Definition
Opposition to flow
Term
Laminar Flow/Peripheral Resistance
Definition
Measure of the amount of friction blood encounters
Term
3 Sources of blood flow resistance
What is the most important*
Definition
Blood flow viscosity
Blood vessel length
*Blood vessel diameter*
Term
In large vessels there will be more/less resistace?
Definition
Less
Term
How is blood vessel length related to blood flow resnistance?
Definition
The longer the vessel, the greater the resistance
Term
Blood viscosity
Definition
Fluid flow resistance/stickiness of blood. 4.5 to 5.5
Term
What is the formula that determines blood flow at a given diameter
Definition
F=r4 r is in mms
Term
T/F Changes in vessel diameter are frequent and significantly alter peripheral resistance.
Definition
T
Term
What do Fatty plaque build cause
Definition
Atherosclerosis
Turbulent blood flow
Dramatic increase in resistance
Term
Atherosclerosis
Definition
Any proliferative (great increase) and degenerative changes leading to decreased elasticity of arteries.
Term
If resistance increases, blood flow will (increase or Decrease)?
Definition
decrease
Term
If blood pressure increases blood flow (increases, decreases)
Definition
increases.
Term
What is more important in in fluencing local blood pressure?
Definition
Resistance
Term
Where does the steepest change in blood pressure occur?
Definition
the arterioles
from about 95 down to 38
Term
Where is systemic pressure highest?
What is the pressure in the right atrium?
Definition
Aorta
0 mmHg
Term
What is pulsatile and where does it occur?
Definition
BP rises and falls. Occurs in elastic arteries near the heart.
Term
Systolic pressure
Definition
Pressure exerted on arterial walls during ventricular contraction 120 mmHg
Term
Diastolic pressure
Definition
lowest level of arterial pressure during ventricular cycle 75mmHg
Term
Pulse pressure
Definition
the difference between systolic and diastolic pressure 120-75=45mmHg
Term
Mean Arterial pressure
Definition
pressure that propels the blood to tissues MAP=diastolic+ 1/3 pulse pressue. ie. 75+45/3=90mmHg
Term
Capillary BP range __-__ mmHg
Definition
20 to 40 mmHg
Term
Venous Blood Pressure is changing or steady?
Definition
Steady... about 20 mmHg
Term
How do you tell the difference if a vein is cut vrs an artery
Definition
A cut vein has EVEN blood flow
A lacerated artery flows in spurts
Term
T/F Venous BP alone is sufficient enough to promote adequate blood return?
Definition
FALSE it is to low, and requires the aid of respiratory pump, a muscular pump and valves.
Term
Respiratory pump
Definition
pressure changes created during breathing suck blood toward the heart by squeezing local veins
Term
Muscular pump
Valves
Definition
contraction of skeletal muscles "milk" blood toward the heart.
Prevent backflow during venous return.
Term
1 way venous valves function
Definition
ensure blood moves only toward the heart.
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