Muscle Tissue
Chapter 4
Anatomy and Physiology
Mr. Rick Knowles
Liberty Senior High School
Do you have as many
muscle cells as Arnold,
girly man?
Three Types of Muscle
Tissue
• Skeletal Muscle Tissue
• Cardiac Muscle Tissue
• Smooth Muscle Tissue
Skeletal Muscle Tissue
• Long Cells- also known as
muscle fibers (+ 1 ft in
length).
• Have many nuclei
(multinucleated).
• Unable to divide, but do have
satellite cells (stem cells) that
can partially repair damage.
Sarcolemma
Sarcoplasm
Nuclei
Muscle Cell (Fiber)
Skeletal Muscle Tissue
• Tissue is Striated- actin and
myosin filaments in cells are
arranged, have a banded
appearance.
• Contraction stimulated by
nerves; voluntary controlStriated Voluntary Muscle.
Skeletal Muscle Tissue
Skeletal Muscle Tissue
Motor End Plate
QuickTime™ and a
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are needed to see this picture.
Cardiac Muscle Tissue
• Found only in heart.
• Is striated.
• Cells are smaller than skeletal
and usually one nucleus.
• Lack satellite cells-unable to
regenerate.
Cardiac Muscle Tissue
• Cells have connectionsIntercalated Discs- cell
membranes interlocked by
CAMs at desmosomes.
• Also, have gap junctions at
these connections.
• What are their functions?
Intercalated Discs
• Desmosomes- • Gap
keep cells
Junctionstogether
ion movement
during
between cells
contractions.
coordinate
contractions.
Cardiac Muscle Tissue
Cardiac Muscle Tissue
• Do not rely on nerve activity for
contraction- have pacemaker
cells- involuntary contraction
(ANS).
• Also called Striated
Involuntary Muscle
So if cardiac muscle can’t
regenerate, what happens
after a heart attack?
Can we grow new cardiac
cells for the heart?
Movie- Scientific American:
Never Say Die
Smooth Muscle Tissue
• Line blood vessels, hollow
organs (bladder), respiratory
and digestive tracts.
• Cells are small, spindleshaped with single nucleus.
• Can divide and regenerate.
Smooth Muscle Tissue
• No striations.
• Contraction part of the ANS,
involuntary.Ex. Peristolsis
• Do have gap junctionscoordinate contractions.
• Nonstriated Involuntary
Muscle
Smooth Muscle Tissue