origin - ✔️✔️Closest to the trunk or to more stationary bone
Insertion - ✔️✔️More distal or more mobile attachment
Antagonistic muscle groups - ✔️✔️flexor-extensor pairs
Flexor - ✔️✔️Brings bones together
Extensor - ✔️✔️Moves bones away
muscle fiber - ✔️✔️a single muscle cell
Sarcolemma - ✔️✔️plasma membrane of a muscle fiber
Sarcoplasm - ✔️✔️cytoplasm of a muscle fiber
sarcoplasmic reticulum - ✔️✔️Organelle of the muscle fiber that stores calcium.
Paramecium - ✔️✔️Connective tissue layer
,fasicles - ✔️✔️bundles of muscle fibers
Myofibril - ✔️✔️tightly packed filament bundles found within skeletal muscle fibers
Tendons - ✔️✔️Connect muscle to bone
Z line - ✔️✔️The attachment site for the thin filaments
M line - ✔️✔️center of sarcomere
A band - ✔️✔️dark area; extends length of the thick filaments
H zone - ✔️✔️thick filaments only
Actin - ✔️✔️thin filaments
Myosin - ✔️✔️thick filament
F-actin - ✔️✔️A fibrous protein made of a long chain of G actin molecules twisted into a helix; main
protein of the thin myofilament
Tropomyosin - ✔️✔️covers myosin binding sites on the actin molecules
Troponin - ✔️✔️regulatory protein that binds to actin, tropomyosin, and calcium
Troponin T - ✔️✔️binds to tropomyosin
, Troponin C - ✔️✔️calcium binding site
Troponin I - ✔️✔️Under resting conditions is bound to actin inhibiting contraction
Regulatory light chains - ✔️✔️regulate ATPase activity of myosin
essential light chain - ✔️✔️stabilizes myosin head
Titin - ✔️✔️Involved in stabilization of thick filaments and the elastic recoil behaviour of muscle
Nebulin - ✔️✔️Regulates the length of thin filaments and contribute to the structural integrity of
myofibrils
T tubules - ✔️✔️infoldings of the sarcolemma which penetrate through the cell and emerge on the other
side
terminal cisternae - ✔️✔️enlarged areas of the sarcoplasmic reticulum surrounding the transverse
tubules.
Mitochondrion - ✔️✔️Cell organelle that converts the chemical energy stored in food into compounds
that are more convenient for the cell to use
Triad - ✔️✔️a T tubule and two terminal cisterns
Muscle Tension - ✔️✔️The force generated by a contracting skeletal muscle
sliding filament model - ✔️✔️states that the thick and thin filaments slide past each other so that their
degree of overlap increases.
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