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Lecture 8

ANAT 101 Lecture Notes - Lecture 8: Axon Terminal, Troponin, Myosin Head


Department
Anatomy and Cell Biology
Course Code
ANAT 101
Professor
Richard Oko
Lecture
8

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Charles Graham 
Muscle Tissue
Skeletal *focus*
Cardiac
Smooth
Cells are called “muscle fibers”
5 functions
Skeletal
Cells are long, striated and multinucleated
Moves or stabilizes the position of the skeleton, and controls sphincters
3 layers of connective tissue:
oEpimysium – covers entire muscle; outer layer
oPerimesium – surrounds each muscle fascicle; houses blood vessels
oEndomesium – surrounds individual muscle fibers; houses capillaries
oAll 3 layers converge to form tendons
Sarcolemma:
ocell membrane of muscle fibers/cells
oopenings lead to network of T tubules (allow electrical stimuli to reach the fibers)
omyofibrils – 100-1000 sarcomeres in each fiber; bundle of thick and thin filament
thin – actin, thick – myosin
osarcoplasmic reticulum – modified version of smooth ER
terminal cistern – sac; stores calcium
Cardiac
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