muscle tissue chapter 4 anatomy and physiology mr. rick knowles liberty senior high school
TRANSCRIPT
Muscle TissueChapter 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.
Muscle Cell (Fiber)
Nuclei
SarcoplasmSarcolemma
Skeletal Muscle Tissue• Tissue is Striated- actin and myosin
filaments in cells are arranged, have a banded appearance.
• Contraction stimulated by nerves; voluntary control- Striated Voluntary Muscle.
Skeletal Muscle Tissue
Skeletal Muscle Tissue
Motor End Plate
QuickTime™ and aGIF decompressor
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 connections-Intercalated
Discs- cell membranes interlocked by CAMs at desmosomes.
• Also, have gap junctions at these connections.
• What are their functions?
Intercalated Discs
• Desmosomes- keep cells together during contractions.
• Gap Junctions- ion movement between cells 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, spindle-shaped with single nucleus.
• Can divide and regenerate.
Smooth Muscle Tissue• No striations.• Contraction part of the ANS,
involuntary.Ex. Peristolsis• Do have gap junctions-coordinate
contractions.• Nonstriated Involuntary Muscle
Smooth Muscle Tissue