Fundamentals of Anatomy and Physiology

Tissues 105

Function Characteristics and Location Morphology (^)
Skeletal (striated voluntary) Skeletal muscle is striated NucleusMyofibrils^
These muscles are attached to (having transverse bands that (^)
the movable parts of the skeleton. run down the length of muscle (^)
They are capable of rapid, fiber); voluntary, because the (^)
powerful contractions and long muscle is under conscious (^)
states of partially sustained control; and skeletal, because
(A)
contractions, allowing for these muscles are attached to (^)
voluntary movement. the skeleton (bones, tendons, (^)
and other muscles). (^)

(B)

Source

Grave/Science V. Eric ©

(B) Photo

(^) ,
® Learning
Cengage
© (A)
Figure 5- 15 Views of skeletal muscle cells.
Cardiac muscle is found only in the heart. Like
skel-etal muscle it is striated and like smooth muscle it is
uninucleated and under the control of the autonomic
nervous system (Figure 5-16). The cells of cardiac -muscle
are cylindrical in shape with branches that connect
to other cardiac cells. These branches connect with one
another through special areas called -intercalated (in-
TER-kah-lay-ted) disks. The cells are much shorter than
either skeletal or smooth muscle cells. This is the muscle
that causes contraction or beating of the heart;
Function
Cardiac
These cells help the heart
contract to pump blood
through and out of the heart.
Characteristics and Location
Cardiac muscle is a striated
(having a cross-banding
pattern), involuntary (not under
conscious control) muscle. It
makes up the walls of the heart.
(A)

(B)

Morphology

Centrally

located

nucleus

Striations

Branching of

cell^

Intercalated

disk

Source

Associates/Science Biophoto ©

(B) Photo

(^) ,
® Learning
Cengage
© (A)
Figure 5- 16 Views of cardiac muscle
cells.