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The given diagram is highly diagrammatic...

The given diagram is highly diagrammatic representation of mammalian heart. In this diagram
Name the parts marked 1-12.

Text Solution

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(i) The phase shown in figure is ventricular systole.
(ii) The lower part consisting of the right and left ventricles are contracting in this phase as the blood is seems to be flowing into the pulmonary artery and main aorta, while the bicuspid and tricuspid valves are closed.
(iii) The parts numbered from A to E are : A - Pulmonary artery. B - Main aorta. C - Pulmonary vein. D - Left auricle. E - Bicuspid valve. F - Right ventricle.
(iv) In part A (pulmonary artery), deoxygenated blood from the heart is flowing to the lungs for oxygenation.
Part B (pulmonary vein) carries oxygenated blood from the lung is flowing to the left auricle, (v) Two valves ie. the bicuspid and tricuspid valves leading from the auricle to the ventricles are closed during systole to prevent the back-flow of blood into the auricles.
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