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Page 1

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B 3c Keep i
t
Mo vi
ng

1.T he j
ob
of
the heart
i
s t
o pump
b l
ood t
o the
lungs
and around
the
body.
2.P ati
en t
s,
w ho
n eed
a
heart
tr
a nspl
ant
usu al
ly
have…

Page 2

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a)
What
subst
ance
tr
avel
s i
n t
he
dir
ect
ion
show by
the
arr
ows?
O xygen
b)
Al
veol
i
are
adapt
ed
for
ef
fi
ci
ent
di
ff
usi
on.
Descr
ibe
two
w ays
in
w hi
ch
t
hey
are
adapt…

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