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13 terms

Parts of Muscle Tissue

STUDY
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Sarcolemma
cell membrane
sarcoplasm
cytoplasm
Transverse Tubules
have openings in sarcolemma; contain intercellular fluid; go into muscle cells like tunnels
Sarcoplasmic Reticulum
Specialized ET; has cisternae
Cisternae
chambers encirling myofibrils; filled with Ca
Triads
T Tubule sandwiched between cisternae
Mitochondria
provide chemical energy in the form of ATP
Myofibrils
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
Actin
thinner; have active sites
Myosin
thicker; head pivots
Sarcomere
smalles fuctional unit of contraction; from Z line to Z line
A Band
where myosin is; dArk band
I Band
where myosin isnt; light band