The Body Contains Three
LEARNING OBJECTiVES
1.
Describe
the types of muscular tissue.
2.
list
the various locations of the types of muscu-
lar tissue.
3.
Outline
the functions of muscular tissue.
uscle accounts for 40-50 percent of your body
mass. Muscle allows the body to move around
in its environment or the organs to move
within the body. Compared to other tissues in
the body, muscular tissue has a limited capacity to divide
and regenerate. There are three types of muscular tissue
(Figure 6.1): skeletal, cardiac, and smooth.
Types o f m uscular tissu e • Figure 6.1
Muscular tissues consist of three types.
Types of Muscular Tissues
Skeletal Muscle tissue is
attached to the Bones
There are about 700
skeletal muscles
in your body.
Skeletal muscles produce body movements, stabilize the
skeleton, and produce much of the heat that helps main-
tain body temperature. Movements of skeletal muscle
can be
voluntary
—you can knowingly contract and relax
them—or
involuntary.
Skeletal muscle tissue is banded,
or
striated
; the striations can be seen only under a mi-
croscope. The ability of skeletal muscle to regenerate is
somewhat limited and involves satellite cells, a type of
stem cell that becomes activated to form new skeletal
muscle cells.
a.
Skeletal muscle tissue
Nucleus
Skeletal muscle fiber
Striations
Skeletal
muscle
fiber
Long cylindrical fiber (cell)
with many peripherally
located nuclei; striated;
unbranched
400x
Longitudinal section of skeletal muscle tissue
Which type of muscle tissue
a. Smooth muscle
is composed of striated cells
b. Skeletal muscle
that are interconnected by
c. Cardiac muscle
intercalated discs?
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154 CHAPTER 6
The Muscular System
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