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35 Cards in this Set
- Front
- Back
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Flow = ?
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P change / R
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P change = ?
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Arterial pressure - venous pressure
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decreased resistance affects flow how?
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increases flow
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causes of turbulent flow
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high velocity, sharp turns, quick decrease in vessel size, rough walls
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laminar flow is only possible with what kind of fluid
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"ideal fluid" or Newtonian fluid
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reynolds number
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Re = density * velocity * length / viscosity
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what is magic Reynolds number?
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3200
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How would you describe flow if Reynolds number is 2000? 5000?
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2000: laminar
5000: turbulent |
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1mmHg = ? mmH2O
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13.6
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types of noninvasive flow meters
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electromagnetic
U/S doppler |
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Resistance = ?
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P change / Flow
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What is peripheral resistance unit? (PRU)
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1 mmHg at 1 ml/sec flow rate
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what is flow rate from fron to back
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CO [l/min]
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CGS units
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dynes * sec / cm^5
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Series resistances add how?
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R1 + R2 + R3 + ....=R
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Parallel resistances add how?
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1/R1 + 1/R2 + 1/R3 + ....=1/R
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Poiseulle's law
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Q = Pi*P change * r^4 / 8nl
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conductance = ?
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1 / resistance
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How does HCT affect viscosity?
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increases viscosity
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diff b/w distensibility and compliance?
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eg, arteries are more compliant
veins are more distensible |
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diff b/w compliance and capacitance?
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eg: veins have more capacitance
arteries are more compliant |
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compliance formua?
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C = volume change / pressure change
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Increased stroke volume's effect on pulse pressure.
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increased pulse pressure
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relative pulse pressure with arteriosclerosis
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increased
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b/c of decreased compliance w/ age, how would expect pulse pressure and avg pressure to change?
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increased pulse pressure
increased avg pressure |
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compliance = distensibility * what?
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volume
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compliance = capacitance * what?
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volume
distensibility and capacitance are interchangeable |
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what is the central venous pressure?
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pressure in the right Atrium
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factors that increase RAP (right arterial pressure)
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incr blood vol
incr venous tone dilation of arterioles decr cardiac function |
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A capillary is composed of a unicellular layer of of endolium surrounded by a ________.
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basement membrane
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how does solute and water move acros the capillary wall
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intracellular cleft or plasmalemma vesicles
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what types of substances can diffuse directly thru cell membrane of capillaries?
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lipid soluble substances
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solid structures in the interstitium
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collagen and proteoglycan
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what is Donnan equilibrim effect?
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when there is charged attraction caused by proteins (need to reword)
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What is the Net filtration pressure (NP) of capillary
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NP = P_c - Pi_c - P_if + Pi_if
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