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CN: Use blue tor A, purpletor B, red lor C, and very light colors for D
andE. (1)Colorthe litles fol syslemicand pulmonarycirculalion;the
lwo figures:and the bordersbrackelinglhe largeillustration.Also color
purple(representingthe transilionalstate belweenoxygenationand
the two capillaries,demonstratingthe ditference
deoxygenation)
betweencapillaryfunclion in lhe lungsversusthe body.(2)Begin in lhe
rightatriumot the heart and color the tlow of deoxygenatedblood (A)
intothe lungs.After coloringthe pulmonarycapillarynetwork(B), color
lbe oxygenatedblood (C) that re-entersthe heart and is pumpedinlo
a ndthrought he s y s t e m i cc i r c u i t .
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Oxygen
aa1
\-.'t
a
d#ry
Carbondioxide
Circulation
ot blood beginswith the heartwhich pumpsblood
intoarteriesand receivesbloodfrom veins.Arleriesconducl
bloodaway from the heart regardlessof lhe amountof oxygen
(oxygenation)
in that blood.Velnsconductbloodtowardthe
heart,regardlessof the degreeof oxygenationof the blood.
Capillaries
are networksof extremelythin-walledvessels
lhroughout
lhe body tissuesthal permilthe exchangeof gases
andnulrientsbetweenthe vesselinterior(vascularspace)and
theareaexternalto the vessel(extracellular
space).Capillaries
receivebloodfrom small arteriesand conductbloodto small
veins.
Therearetwo circuitsof bloodllow:(1) lhe pulmonarycircuit,
whichconveysdeoxygenatedblood trcm the rightside of the
heartto the lungs and treshlyoxygenatedbloodback lo the left
sloeof the heart,and (2) the syslemiccircuit,which conveys
oxygenated
bloodfrom lhe left heart to lhe bodytissuesand
returnsdeoxygenatedbloodto the rightheart.The color red is
useduniversaflyIor oxygenatedbtood;thecolor blue is usedfor
oeoxygenatedblood.
Clearly,
nol all arterialblood is oxygenated(in the pulmonary
circulation,
arleriesconduct deoxygenatedbloodto the lungs),
andnol all venousbloodis deoxygenated
(pulmonary
veins
conductoxygenatedblood to the heart).
Capiltarybloodis mixed;it is largelyoxygenatedon the arterial
sideof the capillarybed, and it is largelydeoxygenatedon the
venousside,as a consequenceof deliveringoxygen
to and
prcking
up carbondioxidelrom the tissuesit supplies.
Onecapillarynelworkgenerallyexistsbetweenan arteryand a
vern;an exceptionis the portal
circulationcharacterizedby two
capillarysets betweenartery and vein.The vein
betweenthe
(w0networks
is the portal vein.Such can be seen betweenthe
gastrointestinal
tract and the live(
i
I
t
t*
PULMONARY
VEIN
L. ventricle
Heart
'muscle
Thoraci can d
abdomi nalwal l
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SYSTEMIC
AFTEFY
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JL
Gastrointeslinal
tracl
Pelvisand
perneum
Lower limb
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