Term
| General structure of a muscle fiber |
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Definition
| Single cell consisting of a cell membrane, cytoplasm, several nuclei and myofibrils. |
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Term
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Definition
| all cellular material outside the nuclei |
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Term
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Definition
| cell membrane of the muscle fiber |
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Term
| Bound by Z disks that hold actin myofilaments |
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Definition
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Term
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Definition
| Light band of a striated muscle where Actin filament is attached to Z disk and not overlapping another filament. |
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Term
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Definition
| Light band of a striated muscle where myosin is not overlapping an actin filament, muscle is relaxed. |
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Term
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Definition
| Dark band of a striated muscle where actin and myosin overlap |
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Term
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Definition
| wraps single muscle fiber |
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Term
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Definition
| several muscle fibers bound together by preimysium |
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Term
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Definition
| wraps several fibers into a bundle called a fascicle |
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Term
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Definition
| very dense fibrous connective tissue used for attachment, helps bind muscles into groupings |
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Term
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Definition
| major/principle muscle within a muscle group |
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Term
| Functions of Muscular System |
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Definition
Body movement
Maintenance of position
respiration
production of body heat
communication
constriction of organs and vessels
heart beat |
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Term
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Definition
contractility
excitability
extensibility
elasticity |
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Term
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Definition
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Term
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Definition
| binding site on actin molecule for caclium |
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Term
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Definition
| protects or covers ative sites within actin strands |
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Term
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Definition
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Definition
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Term
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Definition
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Term
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Definition
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Term
| Disappears during sarcomere shortening |
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Definition
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Term
| Cause striations in myofibrils |
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Definition
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Term
| Storage site for calcium in a muscle fiber |
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Definition
| sarcoplasmic reticulum (SR) |
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Term
| three sources of energy for muscle contraction |
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Definition
creatine phosphate
aerobic respiration
fermentation |
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Term
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Definition
short term muscle contraction energy source
stores do not last long, typically 15-20 seconds |
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Term
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Definition
| most efficient form of ATP generation |
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Term
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Definition
| occurs in absence or reduced state of oxygen and results in breakdown of glucose to yield ATP and lactic acid |
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Term
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Definition
psychological
muscular
synaptic |
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Term
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Definition
| fatigue that is a result of the emotional state of the individual |
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Term
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Definition
| fatigue that results from ATP depletion |
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Term
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Definition
| fatigue that occurs in the neuromuscular junction due to a lack of acetylcholine |
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Definition
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Term
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Definition
functions as a unit due to gap junctions between cells
contract slowly and may be autorhythmic |
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Term
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Definition
cells or groups of cells that act as independent units
contract rapidly |
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Term
| external initiation of smooth muscle |
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Definition
| ligand binding to a g-protein |
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Term
| external initiator of skeletal muscle |
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Definition
| Acetylcholine binding to a nicotinic receptor |
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Term
| internal initiator for skeletal muscle |
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Definition
| Calcium binding to troponin |
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Term
| internal initiator for smooth muscle |
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Definition
| calcium binding to calmodulin |
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Term
| where ATP is used in skeletal muscle |
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Definition
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Term
| where ATP is used in smooth muscle |
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Definition
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