Ch.6 Muscles-Eastham Word Scramble
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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 |
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katieb13102
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