ch6 muscles
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| ability of skeletal muscle to shorten with force | contractility
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| the capacity of 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 length | elasticity
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| connective tissue sheath surrounding skeletal muscle | epimysium
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| connective tissue located outside the epimysium | fascia
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| loose connective tissue surrounding fascicle | perimysim
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| fascicle composed of singe muscle cells called | fibers
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| each fiber surrounded by connective tissue sheath | endomysium
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| cytoplasm in each fiber is filled with | myofibrils
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| myofibrils consist of 2 major protein fibers | actin, myosin
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| thin myofibrils | actin
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| thick myofibrils | myosin
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| actin and myosin myofibraments form highly ordered units | sarcomeres
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| the basic structure and functional unity of the muscle | sarcomere
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| each sarcomere extends from | one z line to another z line
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| the arrangement of these two give a banded appearance | actin, myosin
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| on each side of the z line there is a light area | I band
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| I band consists of | actin
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| darker central region in each sarcomere | A band
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| A band consists of | myosin
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| center of each sarcomere a light area called | H band
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| H band consists of | myosin
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| dark staining band | M line
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| the charge difference across the membrane | resting membrane potential
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| 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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| axons enter the muscles and | branch
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| each branch that connects to the muscle forms a | neuromuscular junction
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| neuromuscular junction or | 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 form a | single muscle
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| the enlarged nerve terminal | presynaptic terminal
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| each presynaptic terminal contains | synaptic vesicles
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| secretes a neurotransmitter | synaptic vesicles
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| neurotransmitter | acetylcholine
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| diffuses across the synaptic cleft and binds the postsynaptic terminal | acetylcholine
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| when the sarcomeres shorten it causes the muscle to | shorten
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| sliding of actin myofilaments past myosin myofilaments during contraction | sliding filament mechanism
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| contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers | muscle twitch
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| a muscle fiber will not respond to a stimulus until that stimulus reaches a level called | threshold
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| threshold where muscle fibers will contract maximally | all-or-none response
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| the time between application of a stimulus to a motor neuron and the beginning of a contraction | lag phase
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| time of contraction | contraction phase
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| the time which the muscle relaxes | relaxation 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 mitochondria | ATP
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| short lived and unstable | ATP
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| ATP degenerates to the more stable | ADP
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| raises the eyebrows | occipital frontals
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| closes the eyelids | orbicularis oculi
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| puckers the lips | orbicularis oris
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| flattens cheeks | buccinator
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| smiling muscle | zygomaticus
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| sneering | levator labii superioris
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| frowning | depressor anguli oris
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| chewing | mastication
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| change shape of tongue | intrinsic
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| move tongue | extrensic
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| lateral neck muscle and prime mover | sternocleidomastoid
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| group of muscles on each side of the back | erector spinae
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| most involved in breathing | external and internal intercostals
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| rotates scapula | trapezius
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| pulls scapula anteriorly | serratus anterior
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| the arm is attached to the thorax by | pectoralis major and latissimus dorsal muscles
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| flexes arm | pectoralis major
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| rotated the arm | latissimus dorsi
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| attached the humerus to the scapula | deltoid
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| extends forearm | triceps branchii
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| flexes forearm | biceps branchii
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| flexes and supinates the forearm | branchioradialis
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| flexes the wrist | flexor carpi
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| extends the wrist | extensor carpi
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| flexes the fingers | flexor digitorium
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| extends the fingers | extensor digitorium
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Created by:
jordannhatten
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