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Q. In the given figure of the heart which of the labelled part $(1, 2, 3,4, 5)$ carries oxygenated blood?
image

Body Fluids and Circulation

Solution:

The labelled parts $'1'$ and $'4'$ are aorta and left ventricle respectively, which carry oxygenated blood. Left ventricle receives oxygenated blood from left auricle which received it from pulmonary veins and this oxygenated blood then moves into the aorta to be supplied to the whole body.