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Ch.6 Muscles-Eastham

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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