smalley
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why does venous return and output of the left heart decreases during inspiration while it increases for the rt heart:
thanks
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But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; and they shall walk, and not faint-Isaiah 40:31
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| tompat
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during inspiration there is -ve pressure in thorax ---that would lead to pulling of blood in right heart as the direction of blood flow is from sup and inf vena cava to rt atrium, ventrical. at the same time blood which is leaving pulmo circulation and going to LA or LV faces increased resistance, so there is less of it reaching LA.
i think the fact that lung is placed between rt and lt heart encased in pleura which expands lung on inspiration causes rt heart to fill more as blood has to come thru it and not thru lt heart.
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| smalley
Forum Elite
Topics: 51
Posts: 284
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thanks tompat
___________________
But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; and they shall walk, and not faint-Isaiah 40:31
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