Shared Flashcard Set

Details

Cardiovascular System
Blood Vessels
43
Anatomy
Undergraduate 1
09/23/2007

Additional Anatomy Flashcards

 


 

Cards

Term
five main types of blood vessels?
Definition
arteries, arterioles, capillaries, venules and veins.
Term
Wall of an artery is made up of what three layers?
Definition
tunic intima, media, and externa.
Term
tunic intima
Definition
innermost coat,endothelium, internal elastic lamina (stretch,recoil), closest to lumen
Term
endothelium
Definition
continuous layer of cells that line the inner surface of the entire CVS
Term
tunic media
Definition
usually the thickest layer, and consists of elastic and smooth muscle fibers.
Term
if an artery has high compliance it means what?
Definition
their walls stretch easily or expand with out tearing in response to a small increase in pressure.
Term
tunic externa
Definition
composed of mainly elastic and collagen fibers
Term
arteries that largest in diameter are
Definition
elastic arteries, because tunic media contains a high proportion of elastic fibers.
Term
elastic arteries functions?
Definition
help propel blood while heart is relaxing
(ex, aorta, brachiophelic..)
Term
arteries medium in diameter are?
Definition
muscular arteries, their tunic media contains more smooth muscle and fewer elastic fibers
Term
muscular arteries fuctions?
Definition
greater vasoconstriction and vasodilation to adjust the rate of blood flow to various parts of the body.
Term
arterioles
Definition
small branch of artery that delivers blood to capillaries
Term
capillaries
Definition
miroscopic vessels that connect aterioles to venules
Term
microcirculation
Definition
the flow of blood from arterioles to venules through capillaries is called;
Term
what vessel has a high metabolic requirement?
Definition
capillaries, extensive networks
Term
capillaries are absent in a few tissues
Definition
cornea and lens of eye and cartilage
Term
capillary walls consist of what?
Definition
a single layer of basement membrane and endothelial cells
Term
capillaries do not contain either of these
Definition
tunic media and externa
Term
blood exchange only occurs between what in capillaries?
Definition
the walls of capillaries and the beginning of venules
Term
metarteriole
Definition
vessel that emerges from atriole and supplies a group of 10-100 capillaries (capillary bed)
Term
capillary beds
Definition
place where oxygen and nutrients cross to cells
Term
capillary beds
Definition
carbon dioxide and metabolic waste products cross into blood
Term
true capillaries
Definition
emerge from metarteriole or arterioles
Term
precapillary sphincters
Definition
controls flow of blood into true capillaries.
Term
what are the three types of capillaries?
Definition
continous,fenestrated, sinusoid capillaries.
Term
continuous capillary
Definition
the plasma membranes of endothelial cells form continuous tube
Term
continuous capillaries are found in?
Definition
the skeletal and smooth muscle, the connective tissues, and the lungs
Term
fenestrated capillary
Definition
plasma membranes of endothelial cells have many fenestrations (porrous)
Term
fenestrated capillaries are found where?
Definition
kidneys, villi of small intestine,
Term
sinusoids
Definition
endothelial have large fenestrations, incomplete and absent of basement membrane
Term
sinusoids are found where?
Definition
spleen, liver
Term
venules
Definition
when several capillaries unite they form small veins called;
Term
venules contain what?
Definition
deoxygenated blood
Term
venules collect blood from capillaries and drain into ?
Definition
veins
Term
small venules closest to capillaries contain?
Definition
tunic interna and media
Term
large venules closest to vein contain?
Definition
tunic externa of vein.
Term
veins are essentially made up of three coats same as arteries what are they?
Definition
tunic intima, media, externa
Term
tunic interna in veins are ____ than arteries
Definition
thinner
Term
tuni media of veins are much ____ than arteries
Definition
thinner
Term
tunic externa , ____ layer of vein
Definition
thickest
Term
veins lack an internal and external what?
Definition
elastic luminae
Term
not made to withstand high pressure
Definition
veins
Term
blood flow is slowest in what?
Definition
capillaries
Supporting users have an ad free experience!