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O LevelBiologyCambridge (CIE)Revision Notes11. Transport in Humans11.3 Blood VesselsCirculation Around the Body

Circulation Around the Body (Cambridge (CIE) O Level Biology): Revision Note

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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

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    Phil

    Author: Phil

    Expertise: Biology Content Creator

    Phil has a BSc in Biochemistry from the University of Birmingham, followed by an MBA from Manchester Business School. He has 15 years of teaching and tutoring experience, teaching Biology in schools before becoming director of a growing tuition agency. He has also examined Biology for one of the leading UK exam boards. Phil has a particular passion for empowering students to overcome their fear of numbers in a scientific context.