Chapter 4 Part II Flashcards Preview

Organ Histo Exam II > Chapter 4 Part II > Flashcards

Flashcards in Chapter 4 Part II Deck (38):
1

blood flow into capillaries is controlled by: (4)

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

2

cells are a single layer of flattened endothelial cells

capillary structure

3

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

pinocytotic
large molecules

4

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

fasciae occludens
cell movement

5

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

continuous capillaries
muscle
CT
many organs

6

often considered to be residual mesenchyme cells
- numerous on capillaries and venules
- can secrete basement membrane and matrix components
*CAN DIVIDE*

pericytes

7

pericytes can change into: (3)

endothelial cells
smooth muscle
fibroblasts

8

functions of pericytes (2)

healing
regulate blood flow (influence lumen size)

9

modified continuous capillary in CNS have ______ INSTEAD OF fasciae occludes

*barrier regulation by endothelium but influenced by astrocytes*

zonula occludens

10

location of fenestrated capillaries (3)

pancreas
intestines
endocrine organs

11

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

fenestrated capillaries
greater movement

12

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

sinusoidal capillaries

13

structure of sinusoidal capillaries

enlarged diameter
many large fenestra with NO protein diaphragm

14

function of sinusoidal capillaries

enhanced exchange between blood and tissue

15

Veins are similar to arteries because have ______

3 tunics

16

veins are DIFFERENT than arteries because (3):

not as uniform in structure
often larger
more veins

17

two flaps of tunica intima and fibroelastic CT

valves

18

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

backflow
skeletal muscle

19

venules are determined by ______ NOT diameter

tunics

20

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

tunica media
tunica adventitia
tunica intima

21

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

tunica intima
tunica media
tunica adventitia

22

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

tunica media
smooth muscle

23

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

leaky venules

24

_____ are similar to venules except a COMPLETE TUNICA MEDIA

small veins

25

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

medium veins

26

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

tunica media

27

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

tunica adventitia

28

_____ in large veins is very similar to medium veins

tunica intima

29

______ in large veins is complete, but THIN

tunica media

30

_____ is usually the thickest layer in LARGE veins

tunica adventitia

31

exceptions to typical structure of veins-
in superficial veins of legs, ______ is WELL DEVELOPED

tunica media

32

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

tunica media
cardiac muscle close to heart

33

exceptions to typical structure of veins-
in vena cava- TUNICA ADVENTITIA- some ____ close to _____

cardiac muscle close to heart

34

exceptions to typical structure of veins- in IVC
tunica adventitia has some _______ close to _____ and some LONGITUDINAL smooth muscle

smooth muscle close to heart

35

enlarged and winding superficial veins in legs

varicose veins

36

possible causes of varicose veins (3)

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

37

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

esophageal varices

38

varicose veins at the end of the anal canal

hemorrhoids