cardiovascular system-blood vessels and circulation Flashcards
arteries
carry blood away from the heart
arterioles
smallest branch of arteries
capillaries
smallest blood vessels
location of exchange between blood and interstitial fluid
venules
collect blood from capillaries
veins
return blood to heart
blood vessels distribute
oxygenated blood from the heart via
aorta–>arteries–>arterioles–>capillaries
largest arteries like aorta has
elastic walls which can extend and recoil during systole and diastole
the wall of arteries and veins consist of how many layers
3
what layers do arteries and veins have in common
inner tunica intima
middle tunica media
outer tunica externa (tunica adventitia)
- inner tunica intima
consists of endothelium- layer of simple squamous epithelium
a basal lamina and internal elastic membrane
in arteries is a layer of elastic fibers in outer margin of tunica intima
- middle tunica media
smooth muscle in loose connective tissue
the collagen fibers bind the tunica media to tunica intia and tunica externa
external elastic membrane
in arteries:
external to tunica media
elastic fibrous tissue, which gives elasticity
separates tunica media from tunica externa
smooth muscles can contract and relax
- tunica externa
aka tunica adventitia
consists of fibrous tissue, elastic fibers, and collagen fibers
anchors vessel to adjacent tissues in arteries
in veins: contains elastic fibers, smooth muscle cells
how many extra layers do arteries have
2
what are the 2 extra layers of the arteries
internal elastic membrane
external elastic membrane
vasa vasorum
“vessels of vessels”
small arteries and veins
in walls of large arteries and veins
supply cells of tunica media and tunica externa
