Blood Vessels (Circulatory SySTEM)

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Blood Vessels (Circulatory System) - Quiz

Blood vessels are part of the circulatory system and transmit blood throughout the body. These vessels are classified into three. Arteries for example carry blood away from the heart, capillaries enable exchange of water and chemicals between blood and tissues and veins carry blood back to the heart. The quest on Blood Vessels (circulatory System) is perfect to test yourself. Try it!


Questions and Answers
  • 1. 

    Which artery wall is responsible for vasoconstriction?

    • A.

      Tunica albuginea

    • B.

      Tunica externa

    • C.

      Tunica fascia

    • D.

      Tunica interna

    • E.

      Tunica media

    Correct Answer
    E. Tunica media
    Explanation
    The tunica media is the correct answer because it is the middle layer of the artery wall that contains smooth muscle cells. These smooth muscle cells are responsible for vasoconstriction, which is the narrowing of the blood vessels. By contracting, the smooth muscle cells in the tunica media reduce the diameter of the artery, thereby increasing the resistance to blood flow and regulating blood pressure.

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  • 2. 

    This layer of the artery is composed mainly of elastic and collagen fibers.

    • A.

      Tunica media

    • B.

      Tunica albuginea

    • C.

      Tunica fascia

    • D.

      Tunica interna

    • E.

      Tunica externa

    Correct Answer
    E. Tunica externa
    Explanation
    The tunica externa is the outermost layer of the artery and is composed mainly of elastic and collagen fibers. This layer provides support and protection to the artery, helping to maintain its structure and integrity. The elastic fibers allow the artery to stretch and recoil, while the collagen fibers provide strength and durability. Overall, the tunica externa plays a crucial role in maintaining the function and structure of the artery.

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  • 3. 

    When an artery or arteriole is damaged, its smooth muscle contracts producing

    • A.

      A vascular spasm

    • B.

      Constriction of the outer four layers

    • C.

      A branch off the artery called an arteriole

    • D.

      A tear in the artery

    • E.

      Tetanus

    Correct Answer
    A. A vascular spasm
    Explanation
    When an artery or arteriole is damaged, the smooth muscle surrounding it contracts, resulting in a vascular spasm. This contraction causes constriction of the outer four layers of the artery, narrowing the blood vessel and reducing blood flow. This response is a protective mechanism to prevent excessive bleeding and to allow time for clotting factors to initiate the formation of a blood clot at the site of injury. A vascular spasm is a temporary response that helps to limit blood loss until further repair can occur.

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  • 4. 

    Elastic arteries function as a

    • A.

      Vasodilator

    • B.

      Pressure reservoir

    • C.

      Vasoconstrictors only

    • D.

      Barrier to microcirculation

    • E.

      Conduit to the tissues of the trunk only

    Correct Answer
    B. Pressure reservoir
    Explanation
    Elastic arteries are responsible for maintaining blood pressure by acting as a pressure reservoir. These arteries have a high number of elastic fibers in their walls, allowing them to stretch and expand when blood is pumped into them. This stretching helps store energy, which is then released when the heart relaxes, pushing blood forward and maintaining a continuous flow. This ability to store and release energy helps regulate blood pressure and ensures a steady flow of blood to the body's tissues.

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  • 5. 

    These vessels make up the largest blood reservoir.

    • A.

      Aorta and veins

    • B.

      Arteries and arterioles

    • C.

      Arterioles and capillaries

    • D.

      Venules and capillaries

    • E.

      Veins and venules

    Correct Answer
    E. Veins and venules
    Explanation
    Veins and venules make up the largest blood reservoir because they have a larger capacity to hold blood compared to other blood vessels. Veins are large, thin-walled vessels that carry deoxygenated blood back to the heart from the body tissues, while venules are smaller vessels that connect veins to capillaries. The high capacity of veins and venules allows them to store a significant amount of blood, which can be quickly redirected to other parts of the body when needed, such as during exercise or in cases of blood loss.

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  • 6. 

    This vessel plays a key role in regulating blood flow into capillaries.

    • A.

      Arterioles

    • B.

      Venules

    • C.

      Veins

    • D.

      Aorta

    • E.

      Arteries

    Correct Answer
    A. Arterioles
    Explanation
    Arterioles are small blood vessels that connect arteries to capillaries. They play a crucial role in regulating blood flow into capillaries by constricting or dilating their walls. This constriction and dilation help control the amount of blood that enters the capillaries, thus regulating blood flow and pressure. Therefore, arterioles are responsible for directing blood to specific areas of the body and maintaining proper blood distribution.

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  • 7. 

    Capillaries are also known as

    • A.

      Vasodilators

    • B.

      Vasoconstrictors

    • C.

      Pressure reservoirs

    • D.

      Distributing vessels

    • E.

      Exchange vessels

    Correct Answer
    E. Exchange vessels
    Explanation
    Capillaries are known as exchange vessels because they are responsible for the exchange of nutrients, oxygen, and waste products between the blood and surrounding tissues. These tiny blood vessels have thin walls that allow for the diffusion of substances. Capillaries play a crucial role in delivering oxygen and nutrients to the cells and removing waste products, making them essential for maintaining proper bodily functions.

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  • Current Version
  • Jan 24, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • May 20, 2010
    Quiz Created by
    Smilebabe
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