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dennis.mcmorrow
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What are the functions of skeletal muscles
- Produce Skeletal Movement
- Maintain Posture
- Support Soft tissue
- Guard entrances and exits
- Maintain body temperature
- Provide Nutrient Reserves
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Attaches muscles to bone.
Tendon
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The collagenous fibers that line and bind fascicles
Perimesium
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Collagenous fiber lining that encapsulates an entire muscle, and is connected to the deep faciae
Epimysium
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The connective tissue that surrounds and protects each individual muscle fiber within the fascicle.
Endomysium
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a broad sheet of connective tissue that muscles bind to. may connect to multiple bones.
Aponeurosis
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Muscle cells are also considered
muscle fiber
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cylindrical structures that fill the sarcoplasm of each muscle cell.
myofibril
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functional units of myofilaments that contract
Sarcomeres
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Point where the motor neuron interacts with muscle fibers by releases acetylcholine vesicles into the synaptic cleft.
Neuromuscular junction
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What happens at neuromuscular junction.
- Electrical impulse travels from the neuron to the muscle cell triggering the release of calcium ions.
- Calcium ions trigger the release of acetylcholine which bind to receptor sites.
- acetylcholine cause the release of sodium ions causing contraction
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Zone of muscle cell with no thick filaments
I Band
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Serves as the boundary between two thin filaments
Z band
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zone in a resting cell that contains thick filaments but no thin filaments
H Band
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Joins each of the thick filaments by their midpoint
M Band
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Dense region of the sarcomere that contains the thick filaments
A Band
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how do muscles move
When actin is exposed to calcium ions, the troponin is moved away exposing the active site for the myosin heads to bond to
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When the active site on the actin is open, the myosin head becomes attracted to it, and it binds dropping the ADP. The myosin recocks when another ATP molecule binds, and it recocks allowing it to powerstroke again to the next active site
Power stroke
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a graph of tension development in muscle fibers
myogram
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All the muscle fibers controlled by a single motor neuron
motor unit
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resting tension in a skeletal muscle
muscle tone
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tension rises exceeding the load, and the muscle length changes
Isotonic contraction
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Muscle contracts not exceeding the load, muscle does not change in length
isometric contraction
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Load - fulcrum - force
first class lever
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Fulcrum - Load - Force
Second class lever
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Fulcrum - Force - Load
Third Class Fulcrum
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