4.3.1 Blood Vessels Flashcards
What do blood vessels do?
Delivery system of dynamic sturctures
Job of arteries
carry blood away from heart
what arteries carry deoxygenated blood
pulmonary circulation and umbilical vessesl of a fetus
job of capillaries
contact tissue cells and serve cellular needs
job of capillaries
contact tissue cells and serve cellular needs
job of veins
carry blood toward the heart
In what order is does blood go to the capillaries to veins
Heart»elastic arteries» Muscular arteries» arterioles» capillaries» postcapillary venules»small veins» Large veins» heart
3 layers in veins and arteries to inner and outer
Tunica intima, tunica media, tunica externa
layers in capillaries
endothelium with sparse basal lamina
What is the job of the lumen
central blood-containg space
tunica intima
minimizes friction for blood in lumen
what is the subendothelial layer for?
basememnt membrane and loose CT, supports endothelium
tunica media layer
smooth muscles an sheets of elastin
what is SMCs regulates by
vasomotor nerve that controls vasoconstriction and vasodilation
where is the tunica media the thickets
arteries
Tunica externa layer
collagen fiber to protect and reinforce
elastin in larger vessels
in lsrge vessels tunia externa contain _____ to nourish external layers
vasa vasorum
why is the tunica externa infiltrated by nerve fibers and lymphatic vessels?
to communicate with tunica media
arteries and veins are usually
parallel
adjacent
parallel
Ekastic conducting arteries.
what do they have?
where are they found?
diameter?
large or small lumen and why?
large thick walled and have elastin in all 3 tunics
aorta and major branches
2.5-1cm diameters
large for low resistance
how does elastic arteries eject blood evenly
pressure reservoirs, expands and recoils with heart,
Muscular arteries
closeness to heart?
diameter?
layer type?
specialties?
distal to elastic arteries, deliver blood to body
1cm to 0.3mm diameter
thick tunica media with more smooth muscle vs elastin
elastic membran on each face of tunic media
arterioles
size?
diameter?
layer?
leads to?
controls flow of??
small arteries
0.3mm-10 micrometer
mostly smooth musle
one layer in smalles arterioles
lead to capillary bed
controls flow in capillary bed by vasodilation and vasoconstriciton
capillaries
how many walls?
how do they stabilize their walls and control permiability?
size?
diameter?
where are there no capillaries
what is it responsibe for?
1 wall (tunica intimad, 1 cell thick)
pericytes
single RBC
8-10 micrometer
cartilage, epithelia, crona and lens of eye
gas exchange. nutrients,wast and hormone
