Use this labelled diagram of a human heart & major blood vessels to answer these Which structure is labelled "K"? questions. 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 A- B Left ventricle Mitral valve C Pulmonary artery Pulmonary valve D- D Pulmonary veins Right atrium N- E Right ventricle M- Superior vena cava Tricuspid valve K-

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