Term
what is cardiac output?
why would both left and right ventricles have the same Q? |
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Definition
"Q" it is the amount blood pumped by either the left or right ventricle of the hear / per minute
- so the flow through the pulmonary and systemic circuits is maintain equally |
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Term
what is the equation for cardiac output?
what is stroke volume? |
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Definition
HR x SV = Q
- the amount of blood pumped by either the left or right ventrile per beat |
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Term
what is fick's principle? |
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Definition
vo2 = HR x SV x (a-VO2)diff
vo2 - o2 uptake or utilization by the tissue in the body
a-vo2 diff - arterial mixed venous o2 diff
*to increase o2 uptake, Q must increase
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Term
what ususally happens during exercise and HR?
when is hr higher? during exercise... |
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Definition
heart will increase linearly with an increasing work load until the max hr is reached
when both arms and legs are utilized
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Term
describe the differences btween untrained and trained |
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Definition
cardiac ouput required for any work rate is similar for both untraine and trained
trained subjects have a higher SV there they have a lower hr while exercising |
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Term
how do you determine SV?
what is EDV?
ESV? |
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Definition
end diastolic volume - end systolic volume
EDV - volum of blood in each ventricle at the end of diastole. (120ml/ in an untrained person @ rest)
ESV - volume of blood in each ventricle at the end of a contraction. (50ml @ rest for an untrained. |
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Term
what is the difference between diastole and systole? |
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Definition
d- resting phaes of the cardiac cycle. b/w heartbeats
s- contraction phase of the cycle- when the ventricles pump out their SV |
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Term
what is the ejection fraction?
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Definition
the % of EDV ejected with each contraction |
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Term
when does sv increase to its highest value ? |
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Definition
during submaximal exercise.. and remains @ constant during the progression from moderate to max work |
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Term
what cause increased blood flow to the working muscles during exercise? |
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Definition
- increased blood pressure
- dilation of arterioles in working muscles because of relaxation of the smooth muscles of the walls
- contriction of arterioles in the gus and non working muscles
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Term
what is poiseuille's law? |
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Definition
resistance to flow = fluid viscosity x tube length
______________________
radius of tube 4 |
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Term
if you were to do a small change in the radius of the blood flow... what would happen ? |
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Definition
it dramatically alters blood flow |
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