Match each description to its correct term.
A. a mesh of cytoskeletal elements that attach the sarcomere to its surrounding components
B. substance that binds to the thick-filament head causing it to release thin filament and return to its low-energy state
C. supply the ATP necessary for muscle contraction
D. component of thin filaments
E. contractile units of muscle
F. cross-bridge is formed between thick and thin filaments following the release of this substance from ATP bound to myosin
G. threadlike protein structures consisting of contractile units arranged end to end; comprises the bulk of the muscle fiber
H. consists of sarcomeres that are not aligned
I. consist of myosin, a motor protein with a clublike head and a long tail
J. this protein repeatedly binds, moves, and releases an adjacent thin filament causing a muscle to contract
K.
A. Z line
B. ATP
C. mitochondria
D. actin
E. sarcomeres
F. phosphate group
G. myofibrils
H. smooth muscle
I. thick filaments
J. myosin
K. sphincter
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a(n) __________. Fill in the blank(s) with the appropriate word(s).
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