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15 Cards in this Set
- Front
- Back
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Isometric |
Contractions of muscle under conditions in which it develops tension but does not change length |
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Isotonic |
Contraction of muscle under conditions in which load on the muscle remains constant but muscle changes length |
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Summation |
Increase in muscle tension or shortening in response to rapid, repetitive stimulation relative to single twitch |
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Tetanus |
Maintained mechanical response of muscle to high-frequency stimulation Also the disease lockjaw |
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Intensity Force Relationship |
Isometric |
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Frequency Force |
Isometric (iso = same; metric = distance) NOT about Ca2+ Summation - generate more force with frequency Tetanus |
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Length Tension |
Isometric Vary length of muscle then shock it |
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Optimal Length (Lo) |
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Load-Velocity Relationship |
Isotonic (iso = same; tonic = strength) Only isotonic contraction Measures distance shortened Light loads are more rapidly moved then heavy loads |
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Preload |
The amount of filling of ventricles just prior to contraction; the end-diastolic volume |
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Afterload |
The end load against which the heart contracts to eject blood |
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Fatigue |
The decline in ability of a muscle to generate force
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Slow-Oxidative Skeletal Muscle |
Slow Twitch (posture) - Don't fatigue rapidly - Small diameter - Myoglobin = red meat - Mitochondria - Rich blood supply |
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Fast-Glycolytic Skeletal Muscle |
Fast Twitch (jumping, sprinting) - Fatigue quickly - Large diameter = high myofibrils in parallel = more force - Powerful - No blood supply - Little mitochondria - Little myoglobin = white meat - Example = Crocodiles, tire easily after about 5 min. |
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Fast-Oxidative Glycolytic Skeletal Muscle |
Skeletal muscle fibers that have high intrinsic contraction speed and abundant capacity for production of ATP by aerobic oxidative phosphorylation |
