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Chapter 21: Blood Vessels and Circulation (21.1 Blood Vessels (Capillaries…
Chapter 21: Blood Vessels and Circulation
21.1 Blood Vessels
layers
Tunica media
Tunica Externa
Tunica Intima
Arteries
Arterioles
little/no TE
Thin or incomplete TM
Muscular
Most arteries (medium) with lots of muscle cells in TM
Elastic
Pulmonary Trunk and Aorta
TM has lots of elastic fibers and few muscle cells
Elastic evens out force
Veins
Capillaries
endothelium in thin basement membrane
no TM or TE
Types
Sinusoids
Fenestrated Capillaries
Continuous Capillaries
Beds
Precapillary sphincter
Arterial anastomosis
made from
collaterals
Vasomotion
contraction and relaxation cause blood flow to change routes
capillary sphincter
controlled by flux in interstitial fluid