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Ch.6 Muscles-Eastham
| Question | Answer |
|---|---|
| Contractility | to shorten with force |
| Excitability | to respond to a stimulus |
| Extensibilty | to be stretched |
| Elasticity | to recoil to original length |
| Epimysium | surrounds the skeletal muscle |
| Fascia | connective tissue located outside the epimysium |
| Perimysium | surrounds the fascicle |
| Fibers | single muscle cells |
| Endomysium | surrounds the fiber |
| Myofibrils | a threadlike structure that extends from one end of the fiber to the other |
| Actin Myofilaments | thin; 2 strands of pearls twisted together |
| Myosin Myofilaments | thick; bundles of minute golf clubs |
| Sarcomeres | actin and myosin that form highly ordered units; the basic structural and functional unity of the muscle; Z-Line |
| I-Band | actin; white area |
| A-Band | myosin; dark shaded |
| H-Zone | myosin; contains m-line |
| M-Line | myosin; between a-bands in the h-zone |
| outside of cell membrane(resting) | positively charged |
| inside of cell membrane(resting) | negatively charged |
| Action Potential | reverse of charge in resting membrane potential |
| Motor Neurons | nerve cells that carry action potentials to skeletal muscle fibers |
| Neuromusclular Junction | each branch that connects to the muscle |
| Synapse | near center of the cell |
| Motor Unit | a single motor neuron and all the skeletal muscle fibers it innervates |
| Presynaptic Terminal | the enlarged nerve terminal |
| Synaptic Cleft | the space between the presynaptic terminal and the muscle cell |
| Postsynaptic Terminal | the muscle fiber |
| Acetylcholine | diffuses across the synaptic cleft and binds to the postsynaptic terminal Causing a change in the postsynaptic cell |
| Acetylcholinesterase | an enzyme that rapidly breaks down acetylcholine which is released into the synaptic cleft between the neuron and muscle cell |
| Sliding Filament Mechanism | the sliding of actin myofilaments slide past myosin myofilaments during contraction |
| Muscle Twitch | a contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers |
| Threshold | a muscle fiber will not respond to a stimulus until that stimulus reaches level called |
| Lag Phase | the time between application of a stimulus to a motor neuron and the beginning of a contraction |
| Contraction Phase | the time of a contraction |
Created by:
katieb13102
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