Muscle function lecture 17
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13 Terms
what do snake venom block
Blocks the Ach receptors
three major types of muscle
smooth muscle
cardiac muscle
skeletal muscle
what is a skeletal muscle
a long, cylindrical multinucleated fibers
That brings about movement
what are the organization of muscles
skeletal muscles
fascicle
muscle fibers
myofibrils
what is the striation on the muscle fiber
the I band (light)
the A band (dark)
what are myofibrils
Bundled filaments of actin and myosin that allow contractions
what is sarcomere
functional subunit of contraction. it has thin filament of actin, thick filament of myosin and accessory proteins.
the I bands and the A bands are what
the thin filament of actin are the I bands
the thick filament of myosin are the A bands
what do myosin heads do
ATP causes conformational change
what do actin do
each monomer has myosin binding site
what does ATP cause
the myosin to move along actin
what is tropomyosin do
coil that blocks myosin binding sites
what is tropnin
Ca2+ binding complex that alters tropomyocin position to unblock site
