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Blood vessel function

  • ATI TEAS
  • Science: Human Anatomy and Physiology
  • Multiple choice
  • Difficulty 2 of 5

Question

A diagram shows oxygen leaving blood to reach a working muscle cell. Which type of vessel belongs at the exchange site?

  1. Artery✗ Incorrect

    Arteries carry blood away from the heart toward smaller vessels.

  2. Vein✗ Incorrect

    Veins return blood toward the heart after it passes through exchange vessels.

  3. Arteriole✗ Incorrect

    Arterioles lead into the smaller vessels where exchange occurs.

  4. Capillary✓ Correct

    These tiny vessels connect the arterial and venous sides and permit exchange with tissues.

Answer

D. Capillary

Rationale

Capillaries provide the interface between the blood and tissue cells. Oxygen crosses their walls by diffusion, allowing delivery to the muscle.

RememberCapillaries are the main exchange vessels between blood and tissues.

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