Page 10 - 8.5 MUSCLES

F
F
F
or
or
or
hen
hen
hen
ou
ou
ou
xample,
xample,
xample,
y
y
y
w
w
w
e
e
e
• •For example, when you
r
raise your lower arm,
w
y
e
er
ais
m,
our
ar
lo
some muscles in the
s ome mus c les in the
upper
upper
upper arm contract and
contr
and
contr
ar
m
and
upper ar m contr act and
m
ar
act
act
lo
ar
er
pull the lower arm
m
w
pull
the
At
ds
the
.
ame
up
s
ar
w
upwards. At the same
c

mus
mus
c

les
time,
les

time, other mus c les of
of
of
other
time, other muscles of
time,

other
ar
the upper arm relax.
m
upper
r
elax.
the
aighten
tr
tr
tr
aighten
aighten
hen
hen
y
y
y
hen
W W W
When you straighten the
the
the
the
ou s
ou s
ou s
lo w er ar m a gain, the
lower arm again, the
opposite happens.
oppos ite ha ppens .
and
c
T
T
and
les
mus
mus
les
mus
• •Thus, the muscles and
les
,
,
hus
,
the

the
the

T
and
c
c

hus
hus
to
to
w

w
or
or
bones
bones w or k together to
bones

bones work together to
together
together
k
k
of
v
help in the mo v ement of
v
of

ement
ement
mo
in the
in the
mo
help
help in the movement of
help
the body .
the body.