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31 Cards in this Set

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  • Back
What 3 factors influence resistance in blood vessels?
1. Length
2. Viscosity
3. Radius
What is Poiseuille's Law?
Flow = ((P1 - P2) * (r**4) * PI) / (Viscosity * Length * 8)
Upon provocation, a healthy vessel gets ___, but a diseased vessel gets ____.
better
worse
What is central venous pressure (CVP)?
The pressure in the right atrium
Venous return is _____ proportional to the central venous pressure (CVP)
inversely
Cardiac output (CO) and venous return (VR) should be _____.
equal
Normal CVP is ____.
2 - 5 mm Hg
Pressure on the left side of the heart is about ___.
120 mm Hg
What 4 factors influence venous return?
1. Gravity
2. Respiratory cycle
3. Venous tone
4. Muscle pump
What type of pressure is created by gravity?
Hydrostatic pressure
Venous pressure increases by ____ for each cm below the right atrium in a standing person.
1 mm Hg
Venous pressure around the ankle is about ___ .
90 mm Hg.
When shifting from a lying to standing position, aortic mean pressure remains almost unchanged, because __ __ and ___ ___ ___ both rise.
heart rate
total peripheral resistance
Given that the heart level is at pressure 0, then below the heart, pressure is ___, and above the heart, pressure is ___.
positive
negative
Pressure measured = ___ ___ + ___ ___
circulatory pressure
hydrostatic pressure
"Phasic" or venous flow is also called ______.
spontaneous
Although venous flow is generally phasic, venous flow close to the heart may be partially _____.
pulsatile
During inspiration, venous flow to the heart ____, and venous flow in the legs _____.
increases
decreases
During expiration, venous flow to the heart ____, and venous flow in the legs _____.
decreases
increases
During inspiration, central venous pressure (CVP) _____, thereby ____ venous return.
decreases
increasing
What are the 3 pump systems in the lower extremity?
1. Foot pump
2. Thigh pump
3. Calf venomotor pump
What is the function of the foot pump?
It primes the calf pump.
What is the function of the thigh pump?
It ejects the thigh blood volume
What is the function of the calf venomotor pump?
Major ejection
What are two structures of the venous system we should know, and which venous system does each belong to?
Great saphenous vein (belongs to deep venous system)

Lesser saphenous vein (belongs to superficial venous system)
The greater saphenous vein is on the ____ side.
medial
The lesser saphenous vein is on the ____ side.
lateral
Internal perforating veins flow from ____ to ____.
superficial
deep
What is the main problem with deep vein thrombosis (DVT)s?
That the clot will eventually make its way to the lungs, and cause pulmonic infarction, which can be deadly if > 20% of the lung function is compromised.
What veins are common donors for grafting?
Saphenous veins
The sympathetic nervous system is associated with ____, and has a ___ effect on the cardiovascular system.
Adrenalin
strong