Page 7 - 8.5 MUSCLES

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3. C A R D I A C M US C LE S :

R
C
A
R
3. CARDIAC MUSCLES :
US
M
C
C
3.
3.
US
M
:
A
S
:
A
I
I
D
D
C
LE
C
LE
C
S
e
c
mus
ar
ar
les
ar
e
e
T
es
pr
pr
pr
es
ent
• •These muscles are present
ent
es
ent
hes
e

T
onl y in our hear t . T hey
only in our heart. They
T
hey
.
.
hey
contr act and r elax
contract and relax
continuously.
y
continuous
l
.
the
the
ol
ol
ol
the
contr
contr
contr
e
e
e
W
W
W
cannot
• •We cannot control the
cannot
cannot
ement
diac

ement
diac
the
the

of
mo
of
mo v ement of the car diac
movement of the cardiac
mo
v
car
car
v
les
les
c
c

muscles, that is, they are
,
t
e
t
,
tha
mus c les , tha t is , they ar e
tha
mus
mus
ar
ar
, they

, they
is
e
is
involuntary in nature.
in v oluntar y in na tur e.
Car
• •Cardiac muscles are
e
mus
les
diac

ar
c
e the
ed

ed
e the
e the

lik
lik
lik
y

y

y
uctur
tr
uctur
oluntar
uctur
v
v
v
tr
tr
s s s
ed
structured like the voluntary
oluntar
oluntar
muscles.
mus
c
.
les