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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


arteriolar diameter.

Anemia :arrow: local tissue hypoxia :arrow: local vasodilators released like Adenosine :arrow: vasodilation of arterioles :arrow: more blood to capillaries, venules, veins to right heart :arrow: more into pulmonary to left heart :arrow: 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


well said meg :idea:


Shouldn't the tissue oxygenation tension increase in hypoxia?As the O2 demand and supply don't tally leading to a tension.....???

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