Blood Vessels Flashcards

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Note: We may include questions that have multiple correct answers. It’s useful to remember specific examples to understand these concepts better.

What are the three types of blood vessels in the body?

Arteries, veins and capillaries.

What is the main function of arteries?

Arteries carry high-pressure blood away from the heart to other parts of the body.

Why do arteries have thick outer walls and a thick layer of muscle and elastic fibers?

Thick outer walls help cope with high pressure to prevent bursting, and the muscle and elastic fibers allow the walls to recoil and maintain blood pressure.

What is the primary function of veins, and how are they structured to perform this function?

Veins carry blood back to the heart. They have thin walls with less muscular tissue, larger lumens, and valves to prevent backflow of blood.

What happens if a vein’s valve becomes faulty?

If a valve is faulty, it may not open wide enough for sufficient blood flow to the heart or may not close completely, causing blood to flow in both directions.

What is the function of capillaries and how are they structured to facilitate this?

Capillaries facilitate the exchange of substances between the blood and body cells. They have very thin walls (one cell thick) to decrease diffusion distance and increase the rate of diffusion.

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