Circulatory Flashcards Preview

Histology > Circulatory > Flashcards

Flashcards in Circulatory Deck (61):
1

efferent side of circulatory system

arteries

2

afferent side of circulatory system

veins

3

What is the most prominent coat of arteries?

media

4

in larger arteries the ... contains dozens of concentrically arranged, menstruated sheets of elastin, also referred to as laminae

tunica media

5

In large arteries ... is a thin layer, compromised mostly of a network of collagen and elastic fibers with scattered fibroblasts and smooth muscle cells

intima

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In larger arteries ... is a layer of irregularly arranged CT. It is rich in collagen fibers and has a coarser texture.

adventitia

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nerves in the adventitia of larger arteries are called

nervi vasorum

8

small blood vessels in the adventitia of larger arteries are called

vasa vasorum

9

With aging there is a progressive decline of distensibility of the elastic arteries. This may be related to increased ...

cross-linking within the component of elastin

10

What are the prominent layers in muscular or distributing arteries?

media and adventitia

11

In contrast to large arteries the muscular arteries have a ... content of elastin and ... are not present in the media.

elastin is greatly reduced; fenestrated sheets are not present

12

the outer boundary of the media in muscular arteries is often made prominent by an ...., another condensation of elastic fibrils

esternal elastic membrane

13

the intima of muscular arteries is bound addict to the media by a prominent ..., which represents a condensation of fibrils of elastin

internal elastic membrane

14

What layer of muscular arteries has fenestrations; thin and lined with flattened endothelial cells

intima

15

Atherosclerosis is characterized by the development of focal thickening (plaques) in the ...

intima

16

plaque formation is initiated when ... collect at sites of endothelial injury

monocytes

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in plaque formation monocytes enter the intimate to differentiate into ... which proceed to scavenge and digest LDL

macrophages

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macrophages become laden with fat during plaque formation and become known as ...

foam cells

19

small arteries are easily identifiable by their circular profile and prominent ... containing several layers of concentrically arranged SM, with various fibers intermingling

media

20

In small arteries the SM content may form up to ... layers

5

21

When the SM content is reduced to 1-2 layers, the vessel is classified as an .... There is no external elastic membrane

arteriole

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The intimate of small arteries consists of ..., opposed to a scalloped internal elastic membrane.

flattened endothelial cells

23

The adventitia of small arteries lacks ... but vasomotor nerves continue to associate with thoughts layers of the media

vasa vasorum

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in comparison to the small artery/arteriole its companion venue shows a much larger ..., and little ...

larger lumen; little SM content

25

Presence of ... between endothelial cells and adjoining smooth muscle cells in arteries may serve as a conduction device that extend the influence of humoral factors circulated by the blood

gap junctions

26

in capillaries numerous ... may lie in close association to the basal lamina

reticular (type III colagen) fibers

27

continuous endothelium of capillaries, arteries and veins is only interrupted at ...

intercellular junctions

28

The cytoplasm of the continuous endothelial cells is characterized by numerous ... which provide for transcellular transport of large molecules and fluid between the plasma and tissue

endocytotic vesicles

29

The continuous endothelial cells of brain capillaries are joined by ..., no gaps are seen (blood-brain barrier)

zonulae occludentes

30

A diaphramous structure containing ... that repel anionic proteins in plasma appears to "close" the window (fenestrations of endothelium of capillaries)

proteoglycans

31

Relatively undifferentiated cells with long cytoplasmic processes that tend to encircle capillary endothelium; contractile function; capable of differentiating into endothelial cells and SM during growth and repair

pericytes

32

When damaged, endothelium can participate in thrombosis formation by release of von Hillenbrand factor from ...

cytoplasmic Weibel-Palade granules

33

What is the thickest layer of small veins (venues)

adventitia - composed of collagen and elastic fibers

34

As venues increase in diameter, ... become more numerous, and SM cells being to appear

pericytes

35

What is the thickest coat in medium veins?

adventitia - contains abundance of collagen fibers

36

The intima of medium veins lacks an

internal elastic membrane

37

... are present in medium veins, representing folds of intimate

valves

38

Blood flow may be directed from capillary beds by passing directly from arterioles to venues through ...; prominent in skin; important in the regulation of heat loss a the body surface.

A-V anastomoses

39

These structures represent atypical capillaries

sinusoids

40

What coat is the most prominent in the the collecting vessels of the lymphatic system?

media

41

What coat is the thickest in the lymph trucks (right lymphatic duct and thoracic duct)

media

42

Endocardium is thickest in the ... and thinnest in the ...

atria; ventricles

43

a surface layer of polygonal shaped cells, continuous with those of blood vascular system

endothelium

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moderately dense, irregular CT with fine collagen fibers superficially and many elastic fibers more deeply

subendothelial layer

45

a relatively looser plan of CT, which is predominantly collagen fibers and continuous with the endomysium of the underlying myocardium

subendocardial layer

46

Which layer of the walls of the heart receives innervations from both divisions of the ANS system?

myocardium

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The myocardium is much thinner in the ... than the ...

atria; ventricles

48

The myocardium in the right ventricle is much ... than that of the left ventricle

thinner

49

terminal branches of the ... pass from the endocardium into the myocardium and give rise to the profuse capillary system

coronary arteries

50

Blood passes from the capillaries into the various cardiac veins, most of which terminate in the ... of the epicardium

coronary sinus

51

Nerves from the sympathetic and parasympathetic division of the ANS form the ...

cardia plexus

52

SA node is located in the ... layer at the junction of the superior vena cava and right atrium

subepicardial layer

53

The AV node and AV bundle lie in the ... of the membranous portions of the inter ventricular septum

subendocardium

54

Valves are covered on both sides by a layer of

endocardium

55

valves contain a supporting layer termed the ..., consisting of collagenous tissue that connects with the fibrous rings (annuli fibrosi) surrounding each valve orifice

fibrosa

56

Fibrosa connects with the ... in the case of the AV valve

chordate tendineae

57

Valves also contain a layer of loose connective tissue termed the ...

spongiosa

58

sponges of valves is rich in ... and is ... in nature

proteoglycans; mucoid

59

Contributes to a valve's pliability and its ability to establish a seal during the cardiac cycle

spongiosa

60

the sponges of the MV develops an exaggerated amount of the ... leading the mitral valve prolapsed

mucoid tissue

61

dense CT that connect the papillary muscles with the fibrous of the leaflets of the AV valves

chordate tendinea