Histology-Arteries, Veins and Capillaries Flashcards Preview

CPR I > Histology-Arteries, Veins and Capillaries > Flashcards

Flashcards in Histology-Arteries, Veins and Capillaries Deck (22)
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1
Q

What types of cells make up the areas indicated by the red arrows?

A

In the heart, cardiac myocytes. In the artery, smooth muscle. In valves, elastic fibers.

2
Q

What cells are indicated by the arrow?

A

Purkinje fibers. Note lighter staining fibers adjacent to endocardium.

3
Q

What is are major differences between the histology of arteries and veins?

A

Arteries have a more robust tunica media and may have elastic fibers. Veins may have smooth muscle in their tunica adventitia.

4
Q

What cells make elastic fibers in the aorta?

A

Smooth muscle cells

5
Q

What is a major difference between elastic and muscular arteries?

A

Muscular arteries have an inner elastic lamella and possibly an outer elastic lamella where elastic arteries have elastic fibers throughout the tunica media.

6
Q

How do you know the blood vessel on the left is a venule and not a lymphatic vessel?

A

Although the venule looks like a lymphatic vessel with very thin walls and no muscle layers, it is transporting RBCs.

7
Q

What blood vessel do you see here?

A

An arteriole. Note it has 1-2 layers of smooth muscle in the vascular wall.

8
Q

If you are a physician interested in controlling smooth muscle contraction in your patient, what control points can you use to do so?

A

Target the influx and sensitivity of calcium in the smooth muscle cell.

9
Q

How is it that histamine can cause vasodilation and vasoconstriction on the same blood vessel?

A

If it binds to the endothelial cell, it induces NO production which relaxes smooth muscle. If it binds to the smooth muscle, it makes it contract.

10
Q

What is the difference between fenestrated and discontinuous capillaries?

A

Fenestrated = small holes or diaphragms between endothelial cells. Discontinuous = holes between endothelial cells.

11
Q

What are the initial cells that begin forming new blood vessels in angiogenesis? Where are they mainly found? 

A

Pericytes. They are mainly found on the basal lamina of venules.

12
Q

What growth factors play a role in angiogenesis?

A

VEGF and FGF

13
Q

What are the three layers of the heart?

A

Epicardium, myocardium and endocardium

14
Q

What type of cardiac layers are found in this sample of the interventricular septum?

A

Myocardium and endocardium

15
Q

What layer of the heart is this?

A

Note fat and blood vessels (coronary arteries and veins) that exist in the epicardium

16
Q

If this is the aorta, where do you expect to find elastic tissue? What cells make this elastin?

A

#2, the tunica media. Smooth muscle cells make the elastin

17
Q

What is this?

A

Vena cava. Note sparse bits of circular smooth muscle in the tunica media and longitudinal smooth muscle in the tunica adventitia (it looks like bacon).

18
Q

Which is the artery and the vein?

A

Note #1 has rippled tunica intima. When you fix the cells, the cells realize there is no pressure and they contract to form the ripples. Also note the thick muscular layer in #1. This is the artery. #2 is they vein.

19
Q

What are the labeled structures?

A

#1) muscular artery a) tunica intima b) tunica media c) tunica adventitia #2) arteriole #3) venule #4) capillary #5) lymphatic

20
Q

What are the labeled structures?

A

1) arterioles 2) venules 3) capillary

21
Q

Where are the discontinuous capillaries found in this image?

A

This is a spleen. They are found in the red pulp.

22
Q

What are the labeled structures?

A

1) artery 2) vein 3) vein 4) lymphatic 5) valve 6) capillary

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