Blood Vessels

Question 1

tunica intima

Answer 1

innermost layer
endothelial cells (simp squa epi)
basal lamina
subendothelial layer (loose CT, scattered smooth mm cells)

Question 2

internal elastic lamina

Answer 2

found in Arteries
elastin
fenestrae
separates intima from media in arteries

Question 3

tunica media

Answer 3

thickest layer in arteries
helically arranged smooth mm 
elastic, reticular fibers, GAGs
III collagen (sec by smooth mm cells)
(replaced by pericytes in capillaries and post capillary venules)

Question 4

external elastic lamina

Answer 4

sep media from adventitia

Question 5

tunica adventitia

Answer 5

outermost layer
long oriented collagen and elastic fibers
Type I collagen
blends into surrounding CT

Question 6

vasa vasorum

Answer 6

in adventitia
nourish adventitia and media of lrg blood vessels
more freq in veins
lymphatic capillaries

Question 7

arteries (largest to smallest)

Answer 7

elastic
muscular
arterials
capillary bed

Question 8

elastic arteries

Answer 8

intima - (int elastic lamina not easy to see)
media
adventitia

Question 9

muscular arteries

Answer 9

intima - int elastic lamina is prominent
media - sev layers of smooth mm cells, circular
adventitia

Question 10

arterioles

Answer 10

media - up to 5 layers smooth mm cells
elastic laminae present in larger arterioles
Weibel-Palade bodies - clotting factor VIII

Question 11

Webel-Palade bodies

Answer 11

Clotting factor VIII

found in arterioles

Question 12

Capillaries

Answer 12

single layer of endothelium and basal lamina
pericytes may be present (equiv to media of arteries)
Continuous/Fenestrated/Discontinuous

Question 13

Continuous Capillaries

Answer 13

NS, muscles
tight junctions
vesicles for transport (may fuse to form channels)

Question 14

Fenestrated Capillaries

Answer 14

Gut, Kidney, Endocrine
thin cytoplasm (holes in cytoplasm)

Question 15

Discontinuous (sinusoidal)

Answer 15

Liver, bone marrow, spleen
discont basal lamina
large gaps
phagocytic cells often present