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20 Cards in this Set
- Front
- Back
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Rectus Abdominus
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O= Pubis I= Xyphoid process A= Depress ribs, flexes vertebral column
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Sternocleidomastoid
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O= sternum and clavicle I= Mastoid region of skull A= flex the neck, bends head toward shoulder and turns face to opposite sie
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Supraspinatus
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O= Scapula I= Humerus A= Abduction at shoulder
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Infraspinatus
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O= Scapula I= Humerus A= Lateral rotation of Shoulder
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Teres Minor
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O= scapula I= humerus A= Lateral rotation at shoulder
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Teres Major
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O= Scapula I= Humerus A= Adduction and medial rotation at shoulder
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Deltoid
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O= Clavicle and scapula I= Humerus A= Abduction at shoulder
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Gluteus Maximus
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O= Iliac Crest I= Iliotibial tract and femur A= Extensionand lateral rotation at hip
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Rectus Femoris
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O= Rim of ilium I= Tibia A= Extension at Knee, flexion at hip.
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Subscapularis
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O= Scapula I= Humerus A= Medial rotation at shoulder
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H Zone
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The H zone is that portion of the A band where the thick and thin filaments do not overlap.
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I band
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The thin filaments extend in each direction from the Z line. Where they do not overlap the thick filaments, they create the light I band.
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A Band
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The thick filaments produce the dark A band. The A bands are bisected by the H zone
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Z Line
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The I bands are bisected by the Z line. Z line occurs when one sarcomere meets another.
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Anatomy of a Sarcomere.
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The thick filaments produce the dark A band.
The thin filaments extend in each direction from the Z line. Where they do not overlap the thick filaments, they create the light I band. The H zone is that portion of the A band where the thick and thin filaments do not overlap. |
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Isotonic:
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Tension rises and the skeletal muscle’s length changes, tension in the muscle remains at a constant level until relaxation occurs.
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Isometric:
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Muscle as a whole does not change length, and the tension produced never exceeds the resistance. Ie. Pushing on a wall or door
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What happens at the neuromuscular junction for contraction to take place?
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•When an electrical impulse is sent, calcium ions are released, which triggers the release of Acetylcholine
•Acetylcholine crosses the synaptic cleft and binds to receptors on the motor end plate •Once the contraction is complete acetylcholineasterase breaks down the acetylcholine molecule |
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How does muscle contraction take place?
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When a sarcomere contracts, the I bands get smaller, the z lines move closer together, and the zones of overlap get larger, but the width of the A bands does not change.
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M Lines
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M Line connects the central portion of each thick filament to its neighbor
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