Blood Vessels Flashcards
The multiple elastic layers in elastic arteries become restricted to two well-defined elastic layers in muscular arteries, the ______ and an ______.
inner elastic lamina; outer elastic lamina
What is a pampiniform plexus?
A countercurrent arrangement between an artery and venous network
Fenestrations in the liver sinusoids permit blood plasma to _____.
directly contact the liver cells
The _____ supporting layer is the tunica adventitia and is comprised of ______.
outer; collagenous tissue
______ have surrounding pericytes.
Post-capillary venules
The ______ is a layer in the middle of the vessel.
tunica media
The adventitia is comparatively thick and contains ____ and ______.
collagen; elastin
_____contain an inner lining of endothelial cells on a thin basement membrane.
Arterioles
End arteries supply a section of a tissue that cannot have an ______.
alternate arterial supply
Lymphatics have only a single, very thin ______ and little discernable ______.
endothelial layer; outer layers
_______ are similar to smooth muscle cells
Myointimal cells
The pulmonary arteries function under ____ pressure.
low
______ also have a layer of elastic and loose collagenous tissues containing intimal cells.
Larger arteries
The outer elastic lamina defines the boundary between the ____ and _______.
media; adventitia
The ______ defines the boundary between the media and adventitia.
outer elastic lamina
In smaller muscular arteries, the _____ is about the same width as the ______, and usually merges with surrounding _______.
adventia; media; connective tissue
Pericytes are surrounded by collagenous fibrils which connect the capillary to _____.
adjacent connective tissue
The _____ is primarily comprised of smooth muscle cells.
media
The outer supporting layer is the ______ and it is comprised of collagenous tissue.
tunica adventitia
A good example of fenestrated endothelium is found in the ________.
glomerulus; of the kidney
The media is primarily comprised of _______.
smooth muscle cells
Arterioles contain an inner lining of ______ on a thin _____.
endothelial cells; basement membrane
The ______ is comparatively thick and contains collagen and elastin.
adventitia
Arteries are _____ as compared to veins, and have approximately the same _______ as the lumen of the vessel itself.
thick-walled; thick-walled
The ______ comprises the inner layer of the vessel and contains a layer of endothelial cells in contact with the blood.
tunica intima
What are pericytes?
unspecialized cells that can give rise to smooth muscle cells during vessel growth and wound healing
The tunica media is comprised of multiple layers of _____, ______, and ______.
elastic laminae, smooth muscle cells, collagen
In fenestrated capillaries there are ____ or fenestrations in the endothelial cells.
pores
The aorta and larger arteries branching from it are referred to as _______.
elastic arteries
Where are myointimal cells?
in elastic arteries
Small veins have an intimal layer of endothelial cells and no ______.
inner elastic lamina
______ are immediately surrounded by 1-2 layers of smooth muscle cells and outer collagenous tissue.
Arterioles
The _______ and _______ are referred to as elastic arteries.
aorta and larger arteries branching from it
In larger vessels, the adventitia contains blood vessels. These are called the ______.
vasa vasorum
Capillaries are the smallest vessels and have ______ surrounding the lumen.
1-2 endothelial cells
Where is a pampiniform plexus found?
in the spermatic cord
In ______ there are pores or fenestrations in the endothelial cells.
fenestrated capillaries
The inner elastic lamina is between the ____ and the ____.
intima; media
The intima is thin and contains _____ and a relatively thin layer of ______.
endothelial cells; connective tissue
Capillaries are about _____ in inner diameter.
5-15μm
______ have only a single, very thin endothelial layer and little discernable outer layers.
Lymphatics
_____ are surrounded by collagenous fibrils which connect the capillary to adjacent connective tissue.
Pericytes
Arterioles are immediately surrounded by ______ and outer ______.
1-2 layers of smooth muscle cells; collagenous tissue
The ____ is thin and contains endothelial cells and a relatively thin layer of connective tissue.
intima
______ may be contractile in nature.
Pericytes
Post-capillary venules have surrounding ______.
pericytes
Larger arteries also have a layer of elastic and loose collagenous tissues containing _______.
intimal cells
______ supply a section of a tissue that cannot have an alternate arterial supply.
End arteries
Small veins have an intimal layer of _____ and no inner elastic lamina.
endothelial cells
Fenestrations permit _____ past the endothelial boundary.
bulk flow of plasma
In larger vessels, the _____ contains _____. These are called the vasa vasorum.
adventitia; blood vessels
What are muscular venules?
larger venules with 1-2 layers of smooth muscles in their media
The ______ is between the intima and the media.
inner elastic lamina
How many elastic layers are found in the intima of the aorta?
30-40
