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48 Cards in this Set

  • Front
  • Back
Transoprot blood away form the heart
Arteries
transport blood away form the arteries
Arterioles
Site of exhange
Capillaries
carry blood to the veins
Venules
carry blood to the heart
veins
what circuit is on the left ventircle,, aorta, body, superior/inferior vena cava right atrium
systemic
right ventricle--> pulmonary trunk/artery-->luns-->pulomonary veins-->left atrium
Pulmonary circuit
central cavity
lumen
innermost layer
Tunica intima
simple squamous epithelium
Inner endothelial lining
loose connective tissue, found in vessels 1 mm diameter
Subendothelial layer
middle layer
Tunica Media
contraction decreases in vessel diameter
vasoconstriction
relaxtion increases the vessel diamter
vasodilation
Tunica media is controlled by
sympathetic ANS
cirucuitly arranged sheets of elstin and collagen fibrils lie between muscle sheets... this contributes to what in the tunica media
Elasticity and strength
the tunica media is thicker in arteriesthan veins this is to...
maintain and resist bld. pressure
the outermost layer
tunica externa
in te tunica externa the cells and fibers run
longitudinally
the function of the tunica externa is
protects the vessel, strengthen its wall and anchors the vessel
Arteries carryy what type of blood in the systemic circuit?
Oxygenated
Arteries carry what type of blood to the pulmonary circuit?
Deoxygenated
the largest arteries
elastic arteris
elastic arteries possess diameter of?
1-2.5 cm
a large lumen in the elastic arteries allows for?
low resistance conduction of blood
these arteris lie distal, posess diameter of .3mm-1 cm
muscular artereis
in the muscular arteries this lies between tunica media and tunica and tunica intima
internal elastic lamina
muscualr arteries this sheet of elastin lies between tunica media and tunic externa
external elastic lamina
these are the smallest artereis
arterioles
the diameter of an arteriole is
10micrometers to .3mm
the largest arterioles posess?
all 3 tunics an an internal elastic lamina
the smalles possess a?
single layer of smooth muscle and endothelium
smallest blood vessel
capillaries
capillaries are composed of single layer of endothelial cells and strengthened and stabilzed by spider shaped cells called?
pericytes
what happens in the capillaries
site of exchange between blood and body tissues or environment
network of capillaries
capillary bed
these regulate te flow of blood into tissue in the cpillary beds
precapillary sphincters
what are the four ways that molecules can pass through capillaries
1. diffusinon through
endothelieal cells
2. Passing through
intercellular clefts
3. Through pinocytic vesicles
and caveole (invaginations
of plasma membrane)
4. through fenestrations
(pores through the
endothelial cells)
(types of capillaries)
endothelial cells lack pores, most comon type, found in skeletal muscle, skin, CNS
Continuous
(types of capillaries) endothelial cells posses pores, found where higher rate of exchange is needed. (ex. small intestine, kidneys, and synovialjoints)
Fenestrated
(types of capillaries)
possess wide gaps between cells and fenestrations present, found where extensive exchange takes place, (es.bone marrow and spleen)
sinusoidal
these posess a diamter of 9-100 micrometers the smalles posess endothelium and pericytes, largest posses all 3 tunics
venules
veins posses what, like arteries
all 3 tunics
what are the three differences compared to arteries
1. Thinner walls,-> tunica
media thinner due to less
smooth muscle
2. Larger Lumen compared to
total vessel diameter
3. Large veins in appendiages
possess semilunar bicuspid
valves
veins hole what percent of total blood volume?
65%
occurs when valves weaken and fail
varicose veins
occurs when blod vessels interconnect and form a Braded network, can occur in either arteris or veins
vascular anastomoses
little arteries, capillaries and veins in the walls of large artereis and veins, needed due to thckness of vessel wall
vasa vasorum