Circulatory System Quiz

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Questions and Answers

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

  • To transport oxygenated blood from the heart to the lungs.
  • To regulate blood pressure through constriction and dilation.
  • To facilitate the exchange of nutrients and gases with body cells. (correct)
  • To collect deoxygenated blood and transport it to the veins.

Which component directly collects blood from capillaries to return it to the circulatory system?

  • Capillary Network
  • Vein
  • Venule (correct)
  • Arteriole

What physical characteristic of capillary walls contributes to their primary function?

  • Highly elastic structures for rapid expansion.
  • A thickness of several millimeters.
  • Multiple layers of endothelial cells.
  • Walls that are one cell thick. (correct)

Which of the following statements regarding capillary networks is true?

<p>They connect arterioles and venules, facilitating nutrient exchange. (B)</p> Signup and view all the answers

What type of blood do veins primarily carry back to the heart?

<p>Deoxygenated blood containing carbon dioxide and waste. (B)</p> Signup and view all the answers

What is a primary characteristic of arteries that differentiates them from veins?

<p>Arteries have thicker muscular and elastic walls compared to veins. (D)</p> Signup and view all the answers

Which statement accurately describes the function of the pulmonary artery?

<p>It transports deoxygenated blood from the heart to the lungs. (B)</p> Signup and view all the answers

How do veins facilitate the return of blood to the heart?

<p>By containing valves that prevent backflow. (D)</p> Signup and view all the answers

Why do arteries have a pulse, while veins do not?

<p>Arteries experience fluctuations in pressure due to blood being pumped from the heart. (A)</p> Signup and view all the answers

Which feature of veins helps reduce the resistance of blood flow back to the heart?

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

What distinguishes the blood carried by the pulmonary vein from other veins?

<p>It carries oxygen-rich blood to the heart. (C)</p> Signup and view all the answers

What is the general pressure condition of blood in veins compared to arteries?

<p>Blood in veins is at low pressure compared to arteries. (D)</p> Signup and view all the answers

Which of the following is NOT a characteristic of arteries?

<p>They have valves to assist blood flow. (D)</p> Signup and view all the answers

Flashcards

Arteries function

Carry oxygenated blood away from the heart to organs and tissues (except pulmonary artery).

Veins function

Return deoxygenated blood to the heart from organs and tissues (except pulmonary vein).

Artery structure

Thick outer wall, narrow lumen, and thick layers of muscle/elastic fibers.

Vein structure

Thin outer wall, large lumen, and thin layer of muscle/elastic fibers.

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Artery Pulse

Arteries have a pulse due to the expanding and relaxing vessel walls.

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Vein Valves

Veins have valves to prevent backwards blood flow.

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Blood vessel types

Arteries, veins, and capillaries.

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Blood vessel network

A system of tubes that carry blood through the body.

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Capillary Walls

Capillary walls are only one cell thick, allowing for easy diffusion of substances between blood and cells.

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Capillary Function

Capillaries are the main site where nutrients and oxygen are delivered to cells, and where waste products like carbon dioxide are collected.

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Capillary Network

Capillaries form a dense network within tissues, ensuring every cell has access to blood supply.

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Diffusion in Capillaries

Oxygen and nutrients move from capillaries to cells, while waste products move from cells to capillaries via diffusion.

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Capillary Connection

Capillaries link arteries and veins, allowing blood to flow from the heart to the tissues and back.

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