Term
| muscular system functions |
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Definition
1. produces movement
2. maintains posture
3. produces heat (75%) |
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Term
| muscular system structure |
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Definition
3 types of muscle
1. skeletal (voluntary and striated)
2. smooth (involuntary and not striated)
3. cardiac (involuntary, straited, and found in the heart) |
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Term
| characteristics of muscle |
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Definition
1. exciteable and respond to stimuli
2. contractile: have ability to shorten
3. extensible: ability to stretch
4. elastic: return to original length |
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Term
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Definition
responsible for moving body
interact with skeleton and cause bones to move relative to each other
more than 600 muscles in body |
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Term
| skeletal muscle structure |
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Definition
tube shaped
larger and longer than most other cells
multi-nucleate
packed with myofibrils |
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Term
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Definition
-bundles of contractile proteins
myosin: thick filaments
actin: thin filaments (microfilaments)
-striped due to arrangement |
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Term
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Definition
repeating unit down the length of the myofibril
-contractile movement
-specific arrangement of actin and myosin
-bound by Z lines
-sarcomeres shorten |
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Term
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Definition
-sliding filament model
-muscles contract when actin filaments SLIDE along myosin filaments shortening the sarcomere |
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Term
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Definition
| tropoponin and tropomyosin |
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Term
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Definition
| -junction between motor neuron and skeletal muscle cell |
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Term
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Definition
-motor neuron and all the muscle cells it stimulates
-all the muscle cells in a given motor unit contract together
-the strength of a muscle contraction depends on |
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