ANATOMY STUFF
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| Muscle Cells | Muscle Fibers
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| Buttocks | Gluteus Maximus
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| Chest Muscle | Pectoral Muscle
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| Anterior Thigh Muscle | Quadriceps Femoris
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| Posterior Thigh Muscle | Hamstrings
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| Back Muscle | Latissimus Dorsi
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| Muscle responsible for smiling | Zygomatics
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| Muscle responsible for sneering | Levator labil superioris
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| Muscle responsible for frowning | Depressor anguli oris
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| Close the eyelid | Orbicularis oculi
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| Ability of skeletal muscle to shorten with force | Contractility
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| Skeletal muscle to respond to a stimulus | Excitability
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| Ability to be stretched | Extensibility
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| Ability to recoil to their original resting length | Elasticity
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| Four Major Function | Contractility, Excitability, Extensibility, Elasticity
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| Flattens the cheeks | Buccinator
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| Changes the shape of the tongue | Intrinsic tongue muscles
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| Moves the tongue | Extrinsic tongue muscles
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| Adenosine triphosphate | ATP
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| The connective tissue sheath surrounding each skeletal muscle | epimysium
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| The connective tissue located outside the epimysium | Fascia
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| Connective tissue surrounding fascicle | Perimysium
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| Fasciculi are composed of a single muscle cell | Fibers
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| connective tissue surrounding each fiber | Endomysium
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| Each fiber is filled with a threadlike structure that extends from one end to another | Myofibrils
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| Myofibrils consist of 2 major kinds of protein fibers | Actin myofilaments, Myosin Myofilaments
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| the ability of skeletal muscle to shorten with force | contractility
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| skeletal muscle to respond to a stimulus | excitability
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| ability to be stretched | extensibility
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| ability to recoil to original resting length | elasticity
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| muscles help produce what | heat
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| sheath surrounding skeletal muscle | epimysium
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| connective tissue located outside the epimysium | fascia
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| muscle composed of numerous bundles | fasciculi
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| loose connective tissue covering fasciculi | perimysium
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| single muscle cells in fasciculi | fibers
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| each fiber is surrounded by a connective tissue sheath called | endomysium
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| each muscle fiber is a single cylindrical cell containing several | nuclei
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| cytoplasm of each fiber is filled with | myofibrils
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| a thread like structure the extends from one end of the fiber to another | myofibrils
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| two major kinds of protein fibers | actin myosin
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| thin myofilaments | actin
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| thick myofilaments | myosin
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| this resembles 2 minute strands of pearls twisted together | actin
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| resemble bundles of minute golf clubs | myosin
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| actin and myosin form highly ordered units | sarcomeres
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| the basic structural and functional unit of the muscle | sarcomere
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| extends from 1 z line to another z line | sarcomere
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| each z line is an attachment site for | actin
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| the arrangement of actin and myosin give a | banded appearance
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| on each side of the z line is a light area called an | I band
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| consists of actin | I band
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| darker central region in each sarcomere | a band
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| in the center of the sarcomere is another light area called | h zone
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| consists of only myosin | h zone
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| the myosin myofilaments are anchored in the center of the sarcomere at a dark staining band called | m line
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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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| each branch that connects to the muscle | neuromuscular junction
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| another word for neuromuscular junction | synapse
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| a single motor neuron and all the skeletal muscle fibers it innervates | motor unit
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| many motor units | muscle
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| a neuromuscular junction is formed by | an enlarged nerve terminal resting in an indentation of the muscle cell membrane
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| the enlarged nerve terminal | presynaptic terminal
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| the space between the presynaptic terminal and the muscle cell | synaptic cleft
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| each presynaptic terminal contains | synaptic vesicles
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| synaptic vesicles secrete a neurotransmitter called | acetylcholine
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| diffuses across the synaptic cleft and binds to the postsynaptic terminal | acetylcholine
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| when sarcomeres shorten it causes the muscle to | shorten
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| a contraction of an entire muscle in response to a stimulus | muscle twitch
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| threshold level where muscle fibers will contract maximally | all-or-none response
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| time between application of a stimulus to a motor neuron and the beginning of a contraction | lag phase
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| muscle remains contracted without relaxing | tetany
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| increase in number of motor units being activated | recruitment
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| needed for muscle contraction | ATP
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| produced in the mitochondria | ATP
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| ATP degenerates to the more stable | ADP
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