Circulatory systems VI

Pregunta	Respuesta
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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