chapter 17 pt. 2
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Last updated 5:29 PM on 1/31/23
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22 Terms
1
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what factors receive more blood during exercise?
* muscle
* heart
* CNS
* skin
* heart
* CNS
* skin
2
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how many x does blood volume increase to the heart during exercise?
4-6x
3
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does blood pH increase or decrease with exercise?
decrease (become more acidic)
4
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what pH is arterial blood?
around 6.9 - 7.5
5
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why does pH decrease during exercise?
build up of H+ and lactic acid
(byproducts of anaerobic metabolism)
(byproducts of anaerobic metabolism)
6
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describe Q during sub max exercise, why?
increase and then levels out at steady state
* increase in HR and SV
* increase in HR and SV
7
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describe HR during submax exercise, why?
increases and then plateaus
* sympathetic NS activation
* sympathetic NS activation
8
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describe SV during submax exercise, why?
increased and then plateaus
* increased venous return
* decreased afterload
* increased venous return
* decreased afterload
9
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SBP, DBP and MAP during sub max exercise
* SBP and MAP increase
* DBP stays the same
* DBP stays the same
10
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describe RPP during submax exercise, why?
increase and then plateaus
* HR and SBP are increasing
* HR and SBP are increasing
11
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describe TPR during exercise duringsubmax exercise, why?
decreases
* Q is rising significantly, along with MAP
* vasodilation, less resistance
* Q is rising significantly, along with MAP
* vasodilation, less resistance
12
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how many ml of blood remain in veins during exerise?
2 - 4 ml
13
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how many ml of O2 is expelled out of caps during exercise?
16 ml
14
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what 3 factors are closely linked with Q?
* SBP
* SV
* VO2max
* SV
* VO2max
15
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what 5 factors affect avO2 difference?
* redistribution of flow to active tissues during exercise
* increased cap density due to training (increases O2 extraction)
* increased # and size of mitochondria
* increased oxidative enzymes
* vascular and metabolic improvements
* increased cap density due to training (increases O2 extraction)
* increased # and size of mitochondria
* increased oxidative enzymes
* vascular and metabolic improvements
16
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what % of VO2max does pH start to decrease?
50%
17
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when is plasma volume decrease the greatest?
the first 5 minutes
18
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why does plasma volume decrease? (2)
* fluid shifts
* sweating
* sweating
19
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what is cardiovascular drift?
an increase in HR without an increase in intensity
20
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when plasma volume decreases, so does blood volume. How does this affect SV and HR?
SV decreases (decreased venous return)
HR increases to compensate to maintain Q
HR increases to compensate to maintain Q
21
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why does cardiovascular drift occur?
SV decreases
22
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does HR effect SV or does SV effect HR?
SV effects HR