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Organ Histo Exam II > Chapter 4 Part II > Flashcards

Chapter 4 Part II Flashcards

1
Q

blood flow into capillaries is controlled by: (4)

A

metarterioles
AVA’s
lumen size of terminal arteriole
pre-capillary sphincters

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2
Q

cells are a single layer of flattened endothelial cells

A

capillary structure

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3
Q

_______ vesicles form tiny pockets through cytoplasm (in capillary) that function to move ______

A

pinocytotic

large molecules

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4
Q

cell junction btwn endothelial cells of capillaries are ______ , which function to move MACROmolecules and allow for ______

A

fasciae occludens

cell movement

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5
Q

MC type of capillaries are ________, which are found (3)

A

continuous capillaries
muscle
CT
many organs

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6
Q

often considered to be residual mesenchyme cells

  • numerous on capillaries and venules
  • can secrete basement membrane and matrix components
  • CAN DIVIDE*
A

pericytes

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7
Q

pericytes can change into: (3)

A

endothelial cells
smooth muscle
fibroblasts

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8
Q

functions of pericytes (2)

A

healing

regulate blood flow (influence lumen size)

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9
Q

modified continuous capillary in CNS have ______ INSTEAD OF fasciae occludes

barrier regulation by endothelium but influenced by astrocytes

A

zonula occludens

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10
Q

location of fenestrated capillaries (3)

A

pancreas
intestines
endocrine organs

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11
Q

_____: pores with thin protein diaphragm containing 8 fibrils that function to allow for ______ of molecules and cells

A

fenestrated capillaries

greater movement

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12
Q 
capillaries that are found in:
bone marrow
liver
spleen
lymphatic organs
certain endocrine organs
A

sinusoidal capillaries

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13
Q

structure of sinusoidal capillaries

A

enlarged diameter

many large fenestra with NO protein diaphragm

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14
Q

function of sinusoidal capillaries

A

enhanced exchange between blood and tissue

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15
Q

Veins are similar to arteries because have ______

A

3 tunics

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16
Q

veins are DIFFERENT than arteries because (3):

A

not as uniform in structure
often larger
more veins

17
Q

two flaps of tunica intima and fibroelastic CT

A

valves

18
Q

functions of valves:
1 protection by preventing ________
2 works with _______ to keep blood moving

A

backflow

skeletal muscle

19
Q

venules are determined by ______ NOT diameter

A

tunics

20
Q

postcapillary venules have NO ____ OR _____, and a _______ with endothelium (small amount of CT and numerous pericytes)

A

tunica media
tunica adventitia
tunica intima

21
Q

collecting venules have _____ with ENDOTHELIUM and small amount of CT, NO _______ and _____ with CT, fibroblasts and some pericytes

A

tunica intima
tunica media
tunica adventitia

22
Q

muscular venules have ALL 3 TUNICS: ______ is incomplete ______ layer

A

tunica media

smooth muscle

23
Q

an incomplete tunica media allows products of inflammation through to loosen endothelial cell junctions so will end up with _______

A

leaky venules

24
Q

_____ are similar to venules except a COMPLETE TUNICA MEDIA

A

small veins

25
Q

tunica intima of _______ is composed of endothelium, basal lamina, CT with reticular fibers, sometimes elastic fiber network (NO IEL)

A

medium veins

26
Q

______ of medium veins is composed of smooth muscle, collagen, fibroblasts

A

tunica media

27
Q

______ in medium veins is usually THICKEST layer; CT with collagen and elastic fibers and a few smooth muscles cells; vasa vasorum is possible

A

tunica adventitia

28
Q

_____ in large veins is very similar to medium veins

A

tunica intima

29
Q

______ in large veins is complete, but THIN

A

tunica media

30
Q

_____ is usually the thickest layer in LARGE veins

A

tunica adventitia

31
Q

exceptions to typical structure of veins-

in superficial veins of legs, ______ is WELL DEVELOPED

A

tunica media

32
Q

exceptions to typical structure of veins-
in pulmonary veins, _______ is WELL DEVELOPED
TUNICA ADVENTITIA- some ____ muscle close to ____

A

tunica media

cardiac muscle close to heart

33
Q

exceptions to typical structure of veins-

in vena cava- TUNICA ADVENTITIA- some ____ close to _____

A

cardiac muscle close to heart

34
Q

exceptions to typical structure of veins- in IVC

tunica adventitia has some _______ close to _____ and some LONGITUDINAL smooth muscle

A

smooth muscle close to heart

35
Q

enlarged and winding superficial veins in legs

A

varicose veins

36
Q

possible causes of varicose veins (3)

A

loss of skeletal muscle tone around the veins
degeneration of vessel wall
valve incompetence

37
Q

varicose veins in lower esophagus; common in alcoholics, cause by portal HTN

A

esophageal varices

38
Q

varicose veins at the end of the anal canal

A

hemorrhoids

Organ Histo Exam II (8 decks)

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