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Published byEve Bock Modified over 3 years ago

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Actual amount of substance supplied (removed) A = Q x ( Ca – Cv)

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What determines flow (Q) Q = (Pa – Pv)/R

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Q Low vascular resistance High vascular resistance (vasoconstriction

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Measurement of Q

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Electromagnetic flowmeter

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Doppler effect

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Fick principle

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Blood flow velocity Q=10ml/s A= 2cm 2 10cm 2 1cm 2 V= 5cm/s 1cm/s 10cm/s V = Q / A abc

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flow Vascular wall

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murmur

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Laminar high flow turbulent laminar velocity

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Resistance to blood flow Rt = R1 + R2 + R3…………. Resistance in series 1/Rt = 1/R1 + 1/R2 + 1/R3…. Resistance in parallel SERIES PARALLEL R1R2R3 R1 R3 R2

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x x x Redistribution in exercise x

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Viskoaity ↑ při ↓↓ Q (anomalous blood viscosity)

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What determines R ? Wall tension vasokonstriction vasodilatation

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Pro trubici platí Laplace r

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Wall tension Q pressure Critical closing pressure

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RECRUITMENT

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exercise

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Blood pressure Q = (Pa – Pv)/R

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systolic diastolic Blood pressure (torr) Mean velocity cm/sec

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Velocity of blood flow Q=10ml/s A= 2cm 2 10cm 2 1cm 2 V= 5cm/s 1cm/s 10cm/s V = Q / A abc

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SYSTOLIC SV elasticity of aorta DIASTOLICR heart rate

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V P

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