Circulatory systems VI

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Flashcards on Circulatory systems VI, created by J yadonknow on 24/04/2018.
J yadonknow
Flashcards by J yadonknow, updated more than 1 year ago
J yadonknow
Created by J yadonknow over 6 years ago
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Question Answer
What is BP? Diff. btw. P in system + transmural P
2 Components of BP Dynamic P generated by HSP of blood in column
What is the R of the whole system equal to? Total R of each individual Resistor
What is the R of a system in parallel? Sum of the inverse of each resistor's R
G G=1/R
How resistors in parallel used in CV Capillaries, adding more resistors decreases total resistance of the system Increases conductance 1/R
Arterioles Small lumen, high resistance ^ time for nutrient absorption
Blood resevoir Veins Blood pools here
Why massaging effect important? If no massaging effect then less blood in heart at end of diastole CO reduced
Diagram P changes in heart Slow curve down. P decreases as R increases.
Arterial pulse pressure wave Pulse pressure Diastolic pressure Dicrotic notch Mean pressure
Dicrotic notch Due to aortic valve closure.
MAP DP+(1/3(SP-DP)) Mean arterial pressure
What is DP? Diastolic pressure T until laminar flow is restored after compression.
Effects of gravity on Fluid E (4) Pt. E from Heart beat KE from fluid itself Pt. E due to position in gravitational field Fluid from total E high -> Total E low
HSP Dynamic P produced by pump
Where is P higher? At base of column as pressure increases in proportion to height of fluid in column.
Where is R greatest? In arterioles
P above heart Arterial pressure decreases w height
P below heart Fluid-column effects ^ arterial P
Arteries are a reservoir of what? Pressure Maintains systemic pressure during DIASTOLIC phase Dampen oscillations in pressure and flow
Pressure in diastole High P on pAO sustained
How are they suited to this? Elastic and recoil to drive blood into arterioles
BP in system Tri+ bi open : Blood flow into ventricle, exapnds Mitral valve closes: Pressure ^ Ventricle relaxes - valves open again
Pressure in systole pAO = pV
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