Term
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Definition
amount of blood pumped per minute per ventricle
CO= stroke volume x heart rate
how much times how fast |
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Term
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Definition
increased by sympathetic stimulation
decreased by parasympathetic (delays pacemaker potential so it doesn't reach threshold as quickly) |
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Term
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Definition
things that affect HR
increase heart rate=positive
decrease heart rate= negative |
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Term
| three influences of stroke volume |
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Definition
EDV (preload) how much is left in heart before contraction
Total Peripheral Resistance (after load) resistance of blood vessels
Contractility- the hearts own ability to contract/ how strong |
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Term
| frank starling law of the heart |
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Definition
^ EDV-> ^contractility-> ^SV
( ↑ TPR → ↓ SV → ↑ EDV next cycle → ↑ contractility → ↑ SV) |
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Term
| extrinsic control from sympathetic and adrenal gland |
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Definition
- cause increase in contractility (Inotropic Effect)
- no direct effect from parasympathetic on contractility |
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Term
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Definition
affects EDV
depends on blood volume and venous pressure
flow is driven by pressure difference between venues |
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Term
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Definition
2/3 intracellular
1/3 extracellular 80% interstitial
20% plasma |
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Term
| two forces that act on fluid exchange |
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Definition
hydrostatic pressures
osmotic pressures |
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Term
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Definition
pressure in a fluid that is set up by a pump
tends to push more on the arterial side |
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Term
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Definition
the pressure needed to prevent osmosis
mostly caused by albumen in blood vessels |
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Term
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Definition
| difference in hydrostatic pressures between capillaries and intersticial fluid |
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Term
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Definition
| difference in collodial osmotic pressure between capillaries and interstitial fluid |
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Term
| how is there a continuous exchange of pressure between capillaries and tissues? |
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Definition
85% of fluid that leave caps return to caps at the end of bed
15% returns via lymphatics |
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Term
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Definition
swelling
excess fluid accumulated in tissues |
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