chapter 6
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| muscle cells | muscle fibers
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| the ability of skeleton muscle to shorten with force | contractility
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| raises the eyebrows | occipitofronatals
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| moves the tongue | extrinsic tongue muscles
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| neck muscles | sternocleidomastoid
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| thin myofilaments | actin myofilaments
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| a connective tissue located outside the epimysium | fascia
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| the ability to be stretched | extensibility
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| the capacity of skeletal muscle to respond to a stimulus | excitability
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| ability to recoil to original resting length after being stretched | elasticity
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| skeletal muscles are surrounded by a connective tissue called | epimysium
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| single muscle cells are called | fibers
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| each fiber is surrounded by a connective tissue | endomysium
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| a threadlike structure that extends from one end of the fiber to the other | myofibrils-
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| think myofilaments | myosin myofilaments
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| actin and myosin myofilaments from highly ordered units | sarcomeres
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| charge difference across the membrane | resting membrane potential
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| the brief reversal back of the charge | action potential
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| nerve cells that carry action potentials to skeletal muscle fibers | motor neurons
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| connection to the muscle forms a, blank, near the center of the cell | neuromusclular junction or synapse
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| one single motor neuron and all the skeletal muscle fibers it innervates | motor units
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| many motor units from how many muscles | single muscle
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| is formed by an enlarged nerve terminal | neuromuscular
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| the enlarged nerve terminal is called | presynaptic terminal
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| the spaces between the presynaptic terminal and the muscle cell is the | synaptic cleft
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| and the muscle fibers are called | postsynaptic terminal
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| each presynaptic terminal contains | synaptic vesicles
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| the synaptic vesicles that secrete a | neurotransmitter
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| the synaptic vesicles that secrete a neurotransmitter called | acetylcholine
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| when an action potential reaches the nerve terminal it causes the synaptic vesicles to releases | acetylcholine
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| when an action potential reaches the blank it causes the synaptic vesicles to releases | nerve terminal
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| when an action potential reaches the nerve terminal it causes the blank to releases acetylcholine | synaptic vesicles
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| the blank diffuses across the synaptic cleft | acetylcholine
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| the acetylcholine defuses across the | synaptic cleft
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| the combination of acetylcholine with its receptor causes an | influx
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| the combination of acetylcholine with its receptor causes an influx of what | sodium ions
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| the sodium ions reflects into the | muscles fibers
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| is a contraction of an entire muscle in response to a stimulus | muscle twitch
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| closes the eyelid | orbiculoris oculis
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| puckers the mouth | orbicularis oris
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| flattens the cheek | buccinator
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| smiling muscle | zygomatics
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| sneering muscles | levator labii superiors
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| frowning | depressor anguli oris
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| chewing | mastication
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| 4 pair of muscles used for chewing | temporalis, masseter, 2pterygoid
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| changes the shape of the tongue | intrinsic tongue muscle
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| moves the tongue | extrinsic tongue muscle
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| prime mover of the neck | sternocleidomastoid
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| wry neck | torticollis
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| single sheet like a muscle that covers the antero lateral neck | platysma
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| platysma single sheet like a muscle that covers the antero lateral neck | antero lateral neck
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| group of muscle that is on each side of the spine | erctor spinal
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| draw scpaula toward veit column | rhomboids
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| flexs, extends and abducts the arm | deltiod
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| contract durning fored expiration | internal intercostal
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| "abs" | rectus abdominis
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| muscles that work together are called | synergists
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| what does oblique mean | at a 45 degree angle
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| 2 types of contraction | isotonic and isomatric
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