Circulatory System Quiz
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Questions and Answers

What is the primary function of capillaries in the circulatory system?

  • Transport blood away from the heart
  • Regulate blood pressure
  • Exchange nutrients and gases with cells (correct)
  • Carry waste products to the kidneys

What is the structure of capillary walls?

  • Lined with elastic tissue
  • Made of multiple layers of cells
  • Thick and muscular
  • One cell thick (correct)

Which blood vessel type connects arteries to veins?

  • Veins
  • Venules
  • Capillaries (correct)
  • Arterioles

In which part of the body do capillaries form dense networks?

<p>All organs and tissues (B)</p> Signup and view all the answers

Which substances diffuse from capillaries to cells?

<p>Oxygen and nutrients (A)</p> Signup and view all the answers

Which statement describes arteries correctly?

<p>Arteries have a thick outer wall. (D)</p> Signup and view all the answers

What is the primary function of veins in the circulatory system?

<p>To return deoxygenated blood to the heart. (A)</p> Signup and view all the answers

Which feature is characteristic of veins compared to arteries?

<p>Large diameter lumen. (D)</p> Signup and view all the answers

Why do veins have valves?

<p>To keep blood flowing in one direction. (D)</p> Signup and view all the answers

How does the blood pressure in arteries compare to that in veins?

<p>Arteries have higher pressure than veins. (D)</p> Signup and view all the answers

Flashcards

Blood Vessels

Network of tubes carrying blood throughout the body.

Capillaries

Tiny blood vessels that connect arteries and veins, enabling nutrient and gas exchange.

Capillary Function

Site where nutrients and gases are exchanged between blood and cells.

Capillary Structure

One cell thick walls allowing easy diffusion of oxygen and nutrients.

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Capillary Network

Dense network of capillaries distributing blood to tissues and collecting waste.

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Arteries vs. Veins

Arteries carry oxygenated blood away from the heart, while veins return deoxygenated blood to the heart. Key structural differences include artery walls being thicker and having a narrower lumen (opening) compared to veins, which have thinner walls and a larger lumen.

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Artery Structure

Arteries have thick walls with a high concentration of muscle and elastic fibers to handle high-pressure blood flow.

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Vein Structure

Veins have thinner walls with a larger lumen to minimize resistance to blood returning to the heart. They contain valves to prevent backflow.

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Artery Function

Carry oxygenated blood away from the heart to the organs and tissues; except pulmonary artery, which carries deoxygenated blood to the lungs.

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Vein Function

Return deoxygenated blood to the heart from the organs and tissues; except pulmonary vein, which returns oxygenated blood from the lungs.

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