Transcript Muscle Tissue

Muscle Tissue
There are 3 types of muscle tissue:
 skeletal
 smooth
 cardiac
Classification of Muscle Cells
Striated vs. Nonstriated
striated have a banded appearance (stripes)
Single nucleus or multinucleated cells
Muscle cells can be controlled
voluntarily (consciously)
or
involuntarily (automatically)
Skeletal Muscle Cells
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Striated, voluntary, and multinucleated
are long, thin and cylindrical; they are
attached to bones and move our skeleton
are usually called “muscle fibers”
do not divide to create new cells
new fibers are produced by stem cells
Striations -- cross stripes (bands) run
perpendicular to the cells
Skeletal Muscle Tissue
Cardiac Muscle Cells
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are called “cardiocytes” and found in
heart walls
branching cells connect at intercalated
disks which allow contractions to occur
faster
are regulated by pacemaker cells which
control contraction of the heart muscles
striated, involuntary, and single nucleus
Cardiac Muscle Tissue
Smooth Muscle Cells
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are small and pointed at their ends
can divide and regenerate new cells
non-striated, involuntary, and single nucleus
found in hollow organs like the intestine,
bladder, lungs, and blood vessels
move substances through hollow opening
by contracting slowly; they squeeze things
through like a tube of toothpaste
Smooth Muscle Tissue
Review What You’ve Learned…
Muscle Type Striated?
# of nuclei
Voluntary or
Involuntary
Skeletal
Yes
Multinucleated
Voluntary
Yes
Single
Nucleus
Involuntary
No
Single
Nucleus
Involuntary
Cardiac
Smooth