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Sliding Filament

Terms to know for Sliding Filament Theory

QuestionAnswer
actin thin protein filaments within a muscle
action potential the electric signal from the spine or the brain that activates a muscle
concentric contraction shortening of a muscle
cross bridge attach myosin filaments to active sites
essentric contraction lengthening phase of muscle contraction
motor unit collectively, a motor neuron and the muscle fibers which it activates
muscle fiber basic muscle cells
myosin thick protein filaments within a muscle
neuromuscular junction point at which a motor neuron attaches to a muscle
sarcolemma the membrane that encases an individual muscle fiber
sarcomere smallest contractile unit of a muscle
sarcoplamic reticulum (SR) runs parallel to and around each myofibril (actin and myosin winds) and contains a system of Tubules
T-Tubules run perpendicular to the SR and in between myosin fibers. They deliver the action potential to the muscle fibers
troponon a protein situated at regular intervals along an actin filament that binds to calcium during contraction
A-Band extends the length of the myosin filaments in a sarcomere
I-Band runs between myosin filaments in adjecent sarcomeres
H-Zone found in the center of the sarcomere and disappears during muscular contraction
Z-Line end borders of a sarcomere
ATP (Adenosine triphosphate) chemical molecule needed by all cels in the body
Hypertrophy the increase of the size of an organ or in a select area of the tissue
Hyperplasia an increase in the number of the cells of an organ or tissue causing it to increase in size.
Created by: ginabina3
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