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  1. #1
    Asclepius1's Avatar
    Asclepius1 is offline Ultimate Member 537 points
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    want answer to tis physio question

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    1 .An increase in which of the following best explains the mechanism
    by which the cardiac output increases in severe anemia?
    A. Arteriolar diameter
    B. Blood viscosity
    C. Peripheral vascular resistance
    D. Splanchnic blood flow
    E. Tissue oxygen tension

  2. #2
    Asclepius1's Avatar
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    physiology

    bld viscosity

  3. #3
    Roxanita is offline Senior Member
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    qs

    arteriolar diameter.



    Anemia local tissue hypoxia local vasodilators released like Adenosine vasodilation of arterioles more blood to capillaries, venules, veins to right heart more into pulmonary to left heart all this to increase preload and hence cardiac output.





    B. Blood viscosity : is decreased due to anemia

    C. Peripheral vascular resistance : reduces

    D. Splanchnic blood flow : decreases/no change

    E. Tissue oxygen tension: decreases, not increases

  4. #4
    Asclepius1's Avatar
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    hey the ans is tissue oxy tension.
    in anemia tissue oxy tension dec so as we need suff oxy we neeed more blood ,so more more blood is pumped.so co incresed

  5. #5
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    qs might be decresed parameter not increase

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    gellerf is offline Member
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    THis is what i got from Berne and Levy

    • The viscosity of the blood depends almost entirely on the concentration of red blood cells.
    • In severe anemia, so many red blood cells burst, that blood viscosity may fall to 1.5X of water, when its usually 3x
    • This decreases the resistance to blood flow in peripheral vessels so that far greater than normal quantities of blood flow through tissues and return to the heart.
    • In addition, hypoxia induces the peripheral tissues to dilate, allowing an even larger amount of blood to return to the heart.
    • This in turn increases the cardiac output of the heart to a higher level, meaning the work load of the heart is largely increased.
    • Since there is more blood traveling through the tissues, the anemia is offset when the person is at rest.
    • However, the heart is already pumping at maximum strength, so when the person begins to excersise, he begins feeling ischemic because the heart cannot increase its output any further
    • Therefore, extreme tissue hypoxia and acute cardiac failure often ensues.

  7. #7
    Unregistered Guest
    So what is the final answer then........A or D. Cause the Q asks "Which Increase?". if the arteriolar diameter increases the flow of blood increases... same goes for splancnic blood flow.......

  8. #8
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    Monsoonrain is offline Member 510 points
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    The Answer is E

    As The tissue oxygen level falls due to anemia ,Severe anemia may cause a condition called high-output heart failure, where the heart must work harder to provide enough oxygen to the brain and other internal organs. The heart beats faster and increases the amount of blood that is delivered per minute.

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