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Alicia Swann

chapter 6

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



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