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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?

They connect arterioles and venules, facilitating nutrient exchange. Signup and view all the answers

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

Deoxygenated blood containing carbon dioxide and waste. Signup and view all the answers

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

Arteries have thicker muscular and elastic walls compared to veins. Signup and view all the answers

Which statement accurately describes the function of the pulmonary artery?

It transports deoxygenated blood from the heart to the lungs. Signup and view all the answers

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

By containing valves that prevent backflow. Signup and view all the answers

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

Arteries experience fluctuations in pressure due to blood being pumped from the heart. Signup and view all the answers

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

A large diameter lumen. Signup and view all the answers

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

It carries oxygen-rich blood to the heart. Signup and view all the answers

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

Blood in veins is at low pressure compared to arteries. Signup and view all the answers

Which of the following is NOT a characteristic of arteries?

They have valves to assist blood flow. Signup and view all the answers