Use this labelled diagram of a human heart & major blood vessels to answer these questions. Which structure is labelled "A"? Aorta • Black arrows indicate direction of blood flow Blue structures contain deoxygenated blood Red structures contain oxygenated blood Cardiac muscle Inferior vena cava Left atrium А B Left ventricle Mitral valve Pulmonary artery Pulmonary valve D- -D Pulmonary veins Right atrium N- M- Right ventricle Superior vena cava G. Tricuspid valve K-

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