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anatomy muscles

body muscles

TermDefinition
T tubules A structure unique to muscle cells is a system of transverse tu-bules, or
Myofibrils bundles of very fine cytoskeletal fila-ments that extend lengthwise along a skeletal muscle fiber and al-most fill the sarcoplasm
sarcomere a segment of the myofibril between two succes-sive Z disks
four different kinds of protein molecules make up myofilaments myosin, actin, tropomyosin, and troponin.
A band the segment that runs the entire length of the thick filaments (also called anisotropic band
I band the segment that includes the Z disk and the ends of the thin fila-ments where they do not overlap the thick filaments (also called isotropic band
H band —the middle region of the thick filaments where they do not overlap the thin filaments
myoglobin During rest, excess oxygen molecules in the sarcoplasm are at-tracted to a large protein molecule
calmodulin The calcium required for contraction comes from outside the cell and binds to a protein called calmodulin
treppe Treppe is a gradual, steplike increase in the strength of contraction that can be observed in a series of twitch contractions that occur about 1 second apart
Created by: dimitrymalishuk
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