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Circulation Around the Body

Exam code: 5090
Written by: Ashika|Reviewed by: Caroline Carroll|Updated 2 July 2026

Main Blood Vessels in the Body

Main Blood Vessels in the Body

  • Blood is carried away from the heart and towards organs in arteries

  • These narrow to arterioles and then capillaries as they pass through the organ

  • The capillaries widen to venules and finally veins as they move away from the organs

  • Veins carry blood back toward the heart

Circulatory System Diagram

main arteries and veins

The circulatory system

Important blood vessels table

Organ

Towards organ

Away from organ

Heart

Vena cava, pulmonary vein

Aorta, pulmonary artery

Lung

Pulmonary artery

Pulmonary vein

Kidney

Renal artery

Renal vein

Liver

Hepatic artery

Hepatic portal vein (from the intestines)

Hepatic vein