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Vascular System and Blood Circulation

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Questions and Answers

What is the primary function of the tunica intima in blood vessels?

To supply oxygen and nutrients to the blood vessel wall

To facilitate blood flow through a smooth, endothelial lining (correct)

To regulate blood pressure through smooth muscle contraction

To provide structural support through collagenous fibers

Which of the following types of arteries is characterized by the presence of elastic fibers, allowing for stretch and recoil with each heartbeat?

Medium-sized arteries or muscular distributing arteries

Arterioles

Veins

Large elastic arteries (correct)

What is the main component of the internal elastic lamina in the tunica intima?

Smooth muscle cells

Collagenous fibers

Reticular fibers

Elastic fibers (correct)

What is the term for the tiny blood vessels found in the tunica adventitia, which supply oxygen and nutrients to the blood vessel wall?

Vasa vasorum Signup and view all the answers

Which layer of the blood vessel wall is composed of circularly arranged smooth muscle cells, elastic fibers, and fine collagenous and reticular fibers?

Tunica media Signup and view all the answers

What is the primary function of the vascular tissue in the body?

To facilitate the exchange of oxygen and nutrients with cells Signup and view all the answers

What is the primary function of blood capillaries in the body?

To facilitate exchange of materials between blood and tissue Signup and view all the answers

What is the typical diameter of blood capillaries?

8-10 μm Signup and view all the answers

What type of capillaries is found in muscle tissue, exocrine glands, and nervous tissue?

Continuous capillaries Signup and view all the answers

What is the structure that forms the wall of blood capillaries?

A single layer of endothelial cells Signup and view all the answers

What is the characteristic of fenestrated capillaries?

They have fenestrae in the endothelial cells Signup and view all the answers

What type of blood vessels are blood sinusoids?

Dilated irregular blood spaces Signup and view all the answers

What is the primary function of the thick walls of arteries?

To maintain diastolic pressure Signup and view all the answers

Which tunica layer of an artery is rich in elastic fibers?

Tunica media Signup and view all the answers

What differentiates a medium-sized artery from a medium-sized vein?

The thickness of the wall Signup and view all the answers

What is the primary component of the ground substance in the tunica media?

Chondroitin sulfate Signup and view all the answers

Which layer of an artery contains vasa vasorum, lymphatics, and nerves?

Tunica adventitia Signup and view all the answers

What is the function of elastic fibers in arteries?

To provide structural support Signup and view all the answers