310
UNIT 2
Covering, Support, and Movement of the Body
9
Table 9.3
Comparison of Skeletal, Cardiac, and Smooth Muscle
CHARACTERISTIC
SKELETAL
CARDIAC
SMOOTH
Body location
Attached to bones or (some facial
muscles) to skin
Walls of the heart
Unitary muscle in walls of hollow
visceral organs (other than the heart);
multi unit muscle in intrinsic eye
muscles, airways, large arteries
Cell shape and
appearance
Single, very long, cylindrical,
multinucleate cells with obvious
striations
Branching chains of cells;
uni- or binucleate; striations
Single, fusiform, uninucleate;
no striations
Connective tissue
components
Epimysium, perimysium, and
endomysium
Endomysium attached to fibrous
skeleton of heart
Endomysium
Presence of
myofibrils composed
of sarcomeres
Yes
Yes, but myofibrils are of irregular
thickness
No, but actin and myosin filaments
are present throughout; dense bodies
anchor actin filaments
Presence of
T tubules and site
of invagination
Yes; two in each sarcomere at A-l
junctions
Yes; one in each sarcomere at
Z disc; larger diameter than those
of skeletal muscle
No; only caveolae
Cells
Perimysium
Epimysium
Endomysium
Endomysium
Endomysium
I band
I band
A band
SR
T tubule
Z disc
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