Arteries and veins have ______________ layers
three
Tunica ___________
(1) also called tunica _________________
(2) ______________________ layer of the blood vessel
adventitia
externa
outermost
Tunica adventitia made of strong, flexible ___________ connective tissue helps hold vessels __________
fibrous
open
Tunica adventitia prevents ________________ of vessels during body movements in veins, _________________ layer; in arteries, thinner than middle layer
tearing
thickest
Tunica ______ is the ______________ layer
media
middle
Tunica media made of ________________ muscle tissue sandwiched together with a layer of _________________ connective tissue
smooth
elastic
Tunica media permits changes in blood vessel _______________________
diameter
the artery tunica media is _________________ than that of the vein
thicker
tunica ________________
____________________ layer
intima
intermost
Tunica intima made of __________________________
in arteries, it is a completely smooth _______________
endothelium
lining
Tunica intima in veins, it forms _________________ valves
semilunar
What are the three layers of blood vessels?
Tunica adventitia -External(outermost)
Tunica media - middle
Tunica intima - intermost
What is the outer layer of a blood vessel?
Tunica adventitia
What is the intermost layer of a blood vessel?
Tunica intima
What is the middle layer of a blood vessel?
Tunica media
Capillaries have only the tunica _______________layer
intima
the endothelium of the capillary wall is thin enough to allow the exchange of important substances between the ____________ and the ___________ ____________
plasma(blood side) intersititial fluid (tissue side)
