P.E Chapter 3 Acute Responses Cardiac System

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jt.mcrae
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97625
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P.E Chapter 3 Acute Responses Cardiac System
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2011-08-19 22:06:43
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Chapter Acute Responses Cardiac System
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P.E Chapter 3 Acute Responses Cardiac System
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  1. What are acute resonses of the cradiovascular system?
    • Increased heart rate
    • Increased stroke volume
    • Increased cardiac output
    • Increased systolic blood pressure
    • Redistribution of blood flow
    • Increased aterio-venous difference
  2. Explain increased heart rate?
    • Response to extra energy required by the body during exercise
    • Heart pumps more bloood to muscles to deliver more o2 and take away waste products
  3. What type of relation ship does heart ratehave with exercise intensity and what is the formula for Max HR?
    • Linear relationship
    • Max HR= 220-age or Max HR = 208- (0.7 x age)
  4. Explain the increase in stroke volume
    • More blood pumped out the heart per beat to give mre o2 to muslces
    • contraction of left ventricle
  5. What are reasons for a higher stroke volume?
    • More blood filling heart on venous return means there is more to pump out- great elastic recoil
    • Decrease in peripheral resistance
    • Increase in neural stimulation
  6. Explain the increase in cardiac output
    • Directly related to a geater stroke volume and high heart rate
    • Q= SV x HR
  7. Explain the increase in systolic blood pressure
    More blood being pumped around more frequently equate to a higher blood pressure in the arteries during contraction
  8. What is the valsalva manoeuvre?
    • Trying to breath out with nose and mouth blocked
    • Tightens core
    • Increases chect cavity pressure
    • Creates an increase in both systolic and diasolic blood pressure
  9. Explain the redistribution of blood flow
    • Blood needs to be redirected the working muscles so they can receive adequate oxygen levels
    • Vasodilation to muscles
    • Vasoconstriction to organs
  10. Explain the increase in arteriovenous difference
    • Difference in o2 concentration between arteries and veins
    • All the o2 is being used at the muscles, hence lower concetration in the veins on return to the heart

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