have openings in sarcolemma; contain intercellular fluid; go into muscle cells like tunnels
Specialized ET; has cisternae
chambers encirling myofibrils; filled with Ca
T Tubule sandwiched between cisternae
provide chemical energy in the form of ATP
100's to 1000's per cell; cylidrical (1-2 mm in diameter); attached to sarcolemma at each end; contraction shortens entire cell; made of myofilaments (protein fibers); 2 types actin and myosin
thinner; have active sites
thicker; head pivots
smalles fuctional unit of contraction; from Z line to Z line
where myosin is; dArk band
where myosin isnt; light band
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