Muscle function lecture 17

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