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The bones, muscles, and joints together form an integrated system called the _____.
The branch of medical science concerned with the prevention or correction of disorders of the musculoskeletal system.
Smooth muscle tissue
Is located in the walls of hollow internal structures, such as blood vessels, airways, the stomach, and the intestines.
Producing body movements
Stabilizing body positions
Storing and moving substances
Functions of muscular tissue.
Thin filaments , Thick filaments
Myofibrils consist of two types of protein filaments called _____ and _____.
A lighter coloured area to either side of the A band that contains thin filaments no thick filaments.
Thick filaments are composed of the protein _____ which is shaped like two golf clubs twisted together.
Golf club handles are arranged parallel to each other, forming the shaft of the thick filament.
In a relaxed muscle, myosin is blocked from binding to actin because strands of the protein _____ cover the myosin binding sites on actin.
1. Release of acetylcholine (ACh)
Diffuses across cleft
3. Activation of ACh receptors
5. Generation of Muscle Action Potential
Repeats with each neuronal action potential
7. Breakdown of ACh
Action at NMJ.
1. Muscle action potential causes Ca2+ to release from Sacroplasmic Reticulum (SR).
2. Ca2+ binds to troponin.
3. Moves tropomyosin off actin sites.
4. Myosin binds & starts cycle.
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