Blood Vessel Structure and Function
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Questions and Answers

What is the main function of elastic fibres in blood vessels?

  • To provide nutrients to vessel walls
  • To prevent blood from flowing back
  • To trap and store blood
  • To enable recoil and maintain continuous blood flow (correct)

    • How do smooth muscles contribute to blood flow regulation?

  • By creating pressure waves that push blood forward
  • By solidifying blood and preventing clotting
  • By contracting to restrict blood flow and relaxing to increase it (correct)
  • By generating heat that aids in blood circulation

    • What structural role does collagen play in blood vessels?

  • It provides strength, structure, and flexibility to the walls (correct)
  • It enhances the elasticity of the blood vessels
  • It helps in the contraction and relaxation of muscles
  • It increases the flexibility of the blood flow

    • Which component is primarily responsible for the stretching of blood vessel walls during a pulse?

    <p>Elastic fibres</p> Signup and view all the answers

    What happens to smooth muscle in blood vessels when more blood flow is needed?

    <p>It relaxes to allow more blood in</p> Signup and view all the answers

    What is the primary function of the pulmonary artery?

    <p>Transport deoxygenated blood from the right ventricle to the lungs</p> Signup and view all the answers

    Which type of blood vessel is primarily responsible for the exchange of substances between blood and tissues?

    <p>Capillaries</p> Signup and view all the answers

    What differentiates elastic arteries from muscular arteries?

    <p>Elastic arteries have a greater proportion of elastic fibers than muscular arteries</p> Signup and view all the answers

    What is the role of valves in veins?

    <p>To prevent backflow of blood</p> Signup and view all the answers

    What distinguishes arterioles from capillaries?

    <p>Arterioles are larger and have thicker walls than capillaries</p> Signup and view all the answers

    How do veins assist in returning blood to the heart from the legs?

    <p>By being near muscle tissues that enhance pressure during contraction</p> Signup and view all the answers

    What type of blood do veins primarily carry?

    <p>Deoxygenated blood</p> Signup and view all the answers

    What is a key characteristic of capillaries that enhances diffusion?

    <p>Single layer of endothelial cells</p> Signup and view all the answers

    Study Notes

    Elastic Fibers

    • Recoil and contract, facilitating blood movement.
    • Enable vessel walls to stretch with blood surges.

    Smooth Muscle

    • Regulates blood flow by contracting or relaxing.
    • Controls blood volume entering tissues.

    Collagen

    • Provides strength, structure, and flexibility to blood vessels.

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    Description

    Explore the essential components of blood vessels including elastic fibers, smooth muscle, and collagen. Understand how these structures work together to regulate blood flow and maintain the integrity of the circulatory system.

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