what are the 3 main blood vessels in the body?

what are the 3 main blood vessels in the human body? Furthermore what are the differences between them in terms of size and function?

It would be great if i could get some in depth anwsers as i want to expand my knowledge on this topic for biology.thankyou!!! :)

5 Answers

  • Anonymous
    1 decade ago
    Favourite answer




    Artieries - thick walled, round in shape, no valves, carry blood away from the heart, blood at high pressure

    Veins - thin walled, often oval, have valves, carry blood towoards the heart, blood at lower pressure (that's why they need valves)

    Capillaries - very fine, very thin walls (one cell thick) leak tissue fluid into their surroundings, link artieries and veins

    John H

  • 1 decade ago

    The three main blood vessels in the body are the arteries, veins and capillaries.

    The arteries are the blood vessels which takes oxygenated blood away from the heart to all parts of the body (except for the pulmonary artery which takes deoxygenated blood to the lungs for gaseus exchange). The arteries usually split up to form arteioles which further subdivide to form the CAPILLARIES.

    THE capillaries runs between the cell and this is where carbon dioxide and oxygen exchange occurs.

    From around the cells the capillaries join to form venules which will further rejoin to form the veins. These veins will take the deoxygenated blood to the heart.the pulmonary vein is one vein which would take oxgenated blood from the lungs to the heart.


    The arterise have thick elastic walls which carries the oxygenated blood from the heart under a high pressure. Since the blood flows under high pressure in this vessel, there is an absence of valves.

    The veins have thinner walls and carries the deoxygenated blood to the heart under a low pressure. Since the blood flows under a low pressure in this vessel, valves are present to prevent the back flow of blood.

    And lastly, the capillaries are the smallest of the three with very thin walls that are only one cell thick. There is an absence of valves.

  • 1 decade ago

    Arteries, Veins and Capillaries.

    Arteries is thick and pump oxygenated blood to all parts of our body. It's elastic and able to hold high blood pressure from heart. Arteries walls are also thick and have muscular walls while Vein is the exact opposite of Arteries.

    Capillaries are small blood vessels that are branched from arteries to vein. This is where most nutrients absorbed by body exchanges place and being filtered.

  • 1 decade ago

    It depends on what your mean by "main." If you refer to size, they may be the aorta (which takes blood from the heart to the body), the inferior vena cava (that returns blood to the heart from the chest down, and the pulmonary artery.(that takes blood to the lungs). The ateries have more complex walls than the vena cava; being a vein, its walls are much thinner.

    If you mean types of vessels, look up arteries, capillaries, and veins...

    Source(s): Former anatomy teacher.
  • What do you think of the answers? You can sign in to give your opinion on the answer.
  • Anonymous
    5 years ago

    c) smooth muscle action. ++++++++++++++++++++++++++++++++++++++... a) decreases the size of the lumen of arteries. ++++++++++++++++++++++++++++++++++++++... b) decreased skeletal muscle action ++++++++++++++++++++++++++++++++++++++... c) take blood to and from the lungs. ++++++++++++++++++++++++++++++++++++++...

Still have questions? Get answers by asking now.