IX - Circulatory System Flashcards Preview

Histology > IX - Circulatory System > Flashcards

Flashcards in IX - Circulatory System Deck (45):
1

Heart: inner layer of endothelium and subendothelial connective tissue

endocardium

2

Heart: middle muscular layer

myocardium

3

Heart: connective tissue with many adipocytes and covered by mesothelium

epicardium

4

Cardiac Conducting System

SA node, AV node, AV bundle of His, Purkinje fibers

5

Cardiac Conducting System: just beneath the endocardium of both ventricles

Purkinje fibers

6

Cardiac Conducting System: greater diameter, abundant glycogen, sparse bundle of myfibrils

Purkinje fibers

7

BV Layers: large vein

tunica externa, media, intima, endothelium

8

BV Layers: elastic artery

tunica externa, media, intima (internal elastic layer, endothelium)

9

BV Layers: medium vein

tunica externa, media, intima, endothelium

10

BV Layers: muscular artery

tunica externa, media, intima, endothelium

11

BV Layers: venule

tunica externa, endothelium

12

BV Layers: arteriole

smooth muscle cells (tunica media), endothelium, basal lamina

13

BV Layers: fenestrated capillaries

endothelial cells with pores

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BV Layers: continuous capillaries

endothelial cells without pores

15

BV: thick walls with small lumen, rounded

arteries

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BV: thin walls with large lumen, flattened

veins

17

Artery Layers: endothelium appears wavy due to the constriction of smooth muscle, internal elastic membrane present in larger vessels

Tunica Intima

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Artery Layers: thickest layers, smooth muscle, elastic fibers, external elastic membrane present in larger vessels

Tunica Media

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Artery Layers: thinner than tunica media in all but the largest arteries, collagen, elastic fibers, nervi vasorum, vasa vasorum

Tunica Adventitia

20

Vein Layers: endothelium appears smooth, no internal elastic membrane

Tunica Intima

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Vein Layers: thinner than tunica adventitia, smooth muscle cells, collagen fibers, nervi vasorum, vasa vasorum, no external elastic membrane

Tunica Media

22

Vein Layers: thickest layer, collagen, smooth fibers, some smooth muscle fibers, nervi vasorum, vasa vasorum

Tunica Adventitia

23

Capillaries: many tight junctions, all exchange occur through cells

continuous

24

Capillaries: small pores

fenestrated

25

Capillaries: larger lumen, large spaces between endothelial cells, discontinuous basal lamina

discontinuous, sinusoids

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Arteries: direction of blood flow

away from heart

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Arteries: appearance

rounded

28

Arteries: pressure

high

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Arteries: wall thickness

thick

30

Arteries: oxygen concentration

high - systemic, low - pulmonary

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Arteries: valves

not present

32

Veins: direction of blood flow

towards heart

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Veins: appearance

flattened

34

Veins: pressure

low

35

Veins: wall thickness

thin

36

Veins: oxygen concentration

low - systemic, high - pulmonary

37

Veins: valves

present in most, limbs, inferior to the heart

38

Collect excess interstitial fluid (lymph) from tissue spaces and return it to blood, distribute lymphocytes, antibodies, other immune components

Lymphatic Circulation

39

Lymphatic Circulation

lymphatic capillaries/lymphatics → lymphatic vessels → thoracic duct/right lymphatic duct

40

Lymphatics are found in most organs except

CNS, bone marrow

41

Lymphatic Vessels: Structure

similar to veins but with thinner walls and no distinct separation between tunics, (+) valves

42

Location of endothelium

Tunica Intima

43

Nevi vasorum control

vasoconstriction and vasodilation

44

Closer to the heart, arteries are expected to have a higher percentage of

elastic fibers

45

Leaky type of capillary in the liver

sinusoid capillary