CIRCULATORY SYSTEM
C
CIRCULATORY SYSTEM
The heart and blood vessels create a continuous
flow of blood around the bodyto provide tissues
with oxygen and nutrients. The circulatory system
also removes waste products. The systemic
circulation deals with the supply of blood to all
parts except the lungs; the pulmonary (lung)
circulation reoxygenates the blood.
Resin cast of coronary arteries
The photograph on the left shows a resin cast ofthe
arteries that supply oxygenated blood to all parts of
the heart muscle. The larger vessels are called the
coronary arteries. They branch offthe root ofthe
aorta, the largest artery in the body, which receives
oxygenated blood directlyfrom the heart.
SYSTEMICCIRCULATION
PULMONARY CIRCULATION
I n t e r n a l c a r o t i d
a r t e r y
E x t e r n a l c a r o t i d
a r t e r y
S u b c l a v i a n
a r t e r y
P u l m o n a r y
v e in
H e a r t
B r a c h i a l a r t e r y
S u p e r i o r
m e s e n t e r i c
a r t e r y
I n fe r io r
v e n a
c a v a
I n t e r n a l
j u g u l a r
v e in
S u b c l a v i a n
v e in
L u n g
R a d ia l
a r t e r y
I lia c
v e in
T r a c h e a
( w i n d p ip e )
S u p e r i o r
v e n a
c a v a
R i g h t a t r iu m
R i g h t v e n t r i c l e
I n fe r io r
v e n a c a v a
G r e a t s a p h e n o u s
v e in
S m a l l s a p h e n o u s
v e in
Key
A o r t a
\ L e f t v e n t r i c l e
A lv e o li
Blood circulation
The right side ofthe heart receives deoxygenated blood from the systemic
(“body”) circulation via the venae cavae. The heart pumps this blood to the
lungs, where it is oxygenated and returns to the left side ofthe heart
(pulmonary circulation). It is then pumped via arteries to the tissues, where
the blood releases oxygen. Deoxygenated blood then returns to the heart.
Oxygenated blood
Deoxygenated blood
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