Anatomy of Arterial Wall Layers

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Which of the following is a characteristic feature of the tunica media in medium-sized muscular arteries?

It is a relatively thin layer with a prominent internal elastic lamina that is thrown into folds.

It is composed of concentric layers of fenestrated elastic laminae separated by smooth muscle fibers.

It is about 50% of the wall thickness and is composed of several concentric layers of smooth muscle fibers with little elastic and collagen fibers in between. (correct)

It contains numerous vasa vasorum that provide nutrition to the adventitia and outer part of the media.

What is the function of the fenestrations in the elastic laminae of large arteries?

To enable the formation of arteriovenous anastomoses.

To allow the entry of additional blood during systole.

To provide elasticity to the arterial wall.

To facilitate the diffusion of nutrients through the arterial wall. (correct)

Which of the following statements about the tunica adventitia is correct?

It contains the external elastic lamina, which is particularly prominent in larger muscular arteries.

It is about 20% of the wall thickness and merges into the surrounding connective tissue. (correct)

It is composed of concentric layers of fenestrated elastic laminae separated by smooth muscle fibers.

It is a relatively thin layer with a prominent internal elastic lamina that is thrown into folds.

What is the function of the vasa vasorum in the tunica adventitia?

To provide nutrition to the adventitia and outer part of the media since the wall is too thick to be nourished only by diffusion from the lumen. Signup and view all the answers

Which of the following structures is responsible for the folding of the internal elastic lamina in medium-sized muscular arteries?

Smooth muscle fibers in the tunica media Signup and view all the answers

Which of the following structures is not a component of the tunica intima in medium-sized muscular arteries?

Smooth muscle fibers Signup and view all the answers

What is the histological structure of capillaries?

Single layer of endothelial cells with pericytes Signup and view all the answers

What is a distinguishing characteristic of capillaries?

Large number of pinocytotic vesicles Signup and view all the answers

Which structure partially surrounds the endothelial cells of capillaries and post-capillary venules?

Pericytes Signup and view all the answers

What is the purpose of the basal lamina in relation to endothelial cells?

Enclosures for endothelial cells Signup and view all the answers

Which vessels connect arteries and veins in peripheral circulation?

Arteriovenous shunts Signup and view all the answers

What is the site of trans-migration of white blood cells during inflammation?

Post-capillary venules Signup and view all the answers

Which of the following accurately describes the structure of continuous capillaries?

The endothelial cells overlap, forming marginal folds that project into the lumen. Signup and view all the answers

Which of the following accurately describes the structure of fenestrated capillaries?

The fenestrations are covered by a thin, non-membranous diaphragm. Signup and view all the answers

Which type of capillary is found in muscular tissue, lung, skin, and nervous tissue?

Continuous capillaries Signup and view all the answers

Which of the following statements accurately describes the function of pericytes?

After tissue injury, they may differentiate into smooth muscle cells and endothelial cells. Signup and view all the answers

Which type of capillary is characterized by the presence of fenestrations without a diaphragm, allowing for unrestricted exchange of molecules?

Sinusoidal capillaries Signup and view all the answers

Anatomy of Arterial Wall Layers

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