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25 Cards in this Set
- Front
- Back
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V/Q mismatch |
Does each functioning aveoli have a functioning capillary going to it and vise versus |
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Cardiac systems |
Dist. = Arteries and arterioles Exchange = capillaries Collection and return system = veins |
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How much blood does the heart pump each beat (e.g. stroke volume) |
70mL |
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Heart muscle |
Myocardium Fibers are interconnected in lattice fashion (allows nerve impulses to pass through) |
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Arteries and arterioles tissue |
1. Endothelial tissue 2, smooth muscle (regulate BP, vasoconstriction/dilation) 3. connective tissue (no exchange due to thick walls) |
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What % of our blood is in our Capillaries |
Contain 6% of total blood volume
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Which tissue shave the most Capillaries |
1. Myocardium 2. SkM |
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Precapillary spincters |
Regulate flow into capillaries |
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Durning exercise what happens to capillaries blood flow |
Gets cut off when muscle contract and then flow very quickly through msucles when they relax |
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How much of the blood (at rest) is stores in veins |
65% (why we call them capacitance vessels) |
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Venus pooling (one way valves) |
Muscle pumps Prevents pooling and edema Directs blood back towards heart |
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Aorta and blood flow (aka diastolic pressure) |
Aorta can store some blood between contractions in order to keep blood flowing throughout the entire time |
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What is blood pressure |
Cardiac output x total peripheral resistance |
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Flow is found by |
Flow = Pressure/resistance Cardiac output = MAP/total peripheral resistance |
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What does distolic P indicate |
Peripheral resistance or ease that blood flows from arterioles into capillaries |
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Systolic pressure |
Provides estimate of work of heart and force of blood exerts against arterial walls durning systole |
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Mean arterial pressure def. |
Average force exerted by blood again just arterial walls durning cardiac cycle |
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How to find MAP |
DBP + (0.33 (SBP-DBP) ) |
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Coronary circulation |
Durning diastoli the "extra" blood in the Aorta pumps into the coronary circulation |
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Durning resistance exercise (BP reponse) |
- straining compresses vessels - therefore peripheral resistance in teases - therefore BP increases in an attempt to perfuse tissues |
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What affect does steady state exercise have on BP |
1. Systolic BP increase in a linear relationship with workload |
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BP response to upper body exercise |
Smaller vessels in upper body compress more easily Resistance to flow is increased BP increases Care is required for individuals with heart and valve disease (e.g. old people) |
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BP after endurance exercise |
Hypotensive response - BP temporarily falls below normal resting values - regular exercises are may help control moderate hypertension |
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Rate pressure product |
Estimate of myocardial workload and VO2 RPP = SBP x HR |
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What is RPP at rest and Durning exercise |
6000 at rest to 40 000 Durning exercise |
