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Muscular

Terms

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Agonist - Prime Mover
Muscle whose contracton produces particular movement such as flexion of elbow Ex: Biceps brachi - flexion at elbow
Antagonist
Muscle whose actions opposes Agonist. Ex Biceps Brachi contracts - Anntagonist Triceps Brachi extends.
Synergist
When it contracts - assists Prime Mover in action. Ex: Prime Latissimus dorsi and teres major as synergist.
Origin
Immovable atachment, beginning point of a muscle
Insertion point of a muscle
Moveable attachment, end point of a muscle
Sarcomere
Smallest smallest functional unit of muscle. Z-line to Z-line is one sarcomere
Sliding filament theory
How Actin and Myosin interacts and how Sarcomere contracts
Z-lines
In middle of I-band. Thin filaments at either end of a sarcomere Proteins that make up the Z line extend toward M Line
M-Line
Thick filaments at the center of the Sarcomere
A-Band
Dark striations seen in muscle fiber. Area containing thick filaments & includes the "M" Line, e"H" band (thick filaments only) & the Zone of overlap.
I-band
Lighter strips seen in muscle fiber. Region between the A-band & the Z-line, which contains only thin filaments.
H-Band
Just Myosin. Region of A-band - thick filaments
Muscle
Made up of Fascicle
Fascicle
Made up of fibers - bundles of fibers in a muscle
Fiber
Muscular cell made up of myofibrils
Myofibrils
Made up of myofilaments, contains little sections called sarcomeres
Myofilaments
Made up of Actin (think filament) and Myosin (thick filament).
How does muscle contract?
All sacromeres contract simultaneously
Myosin
Thick filament - stays in place
Functions of Skeletal Muscle
1. Produce Skeletal Movement 2. Maintains posture 3. Contributes to Temp. Regulation 4. Contrals entrance & exit of body
What do muscles do?
They contract - shorten. They must span a joint
How long is a muscle fiber?
As long as the muscle
Muscle cell
Very long cell - many nuclei.
Epimysium -
Covers whole muscle
Perimysium
Covers fiber

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