chapter 6 muscles
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| muscle cells | muscle fibers
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| muscle responsible for smiling | zygomaticus
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| contractility | the ability of skeletal muscle to shorten with force
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| fascia? | located outside the epimysium. it surrounds and separates the muscle.
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| excitability | the capacity of skeletal muscle to respond to a stimulus.
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| extensibility | the ability to be stretched
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| elasticity | ability to recoil to their original resting length after they have been stretched
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| perimysium | loose connective tissue that surrounds the fascicle.
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| endomysium | the fiber surrounded by the connective tissue.
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| myofibrils | a threadlike structure that extends from one end of the fiber to the other.
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| actin myofilaments | thin myofilaments that resemble 2 minute strands of pearls twisted together.
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| myosin myofilaments | thick myofilaments that resemble bundles of minute golf club.
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| sarcomeres | actin and myosin myofilaments that form highly ordered units.
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| resting membrane potential | the charge difference across the membrane.
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| action potential | the brief reversal back of the charge.
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| motor neurons | nerve cells that carry action potentials to skeletal muscle fibers.
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| motor unit | a single motor neuron and all the skeletal muscle fibers innervates.
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| the space between the presynaptic terminal and the muscle cell is the? | synaptic cleft
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| each presynaptic terminal contains? | synaptic vesicles
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| what happens when the sarcomeres shorten? | it causes the muscle to shorten.
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| muscle twitch | is a contraction of an entire muscle in response to a stimulus that causes the action potential i one or more muscle fibers.
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| when a muscle fiber does not respond to stimulus that stimulus reaches a level called? | threshold
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| all-or-none response | the point where the muscle fiber will contract maximally.
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| lag phase | the time between application of a stimulus to a motor neuron and the beginning of a contraction.
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| a high energy molecule that can be quickly used to produce ATP | creatine phosphate
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| cardiac muscle | is under involuntary control
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| buttocks | gluteus maximus
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| the eyebrow muscle is the | orbicularis oculi
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| anterior high muscle that extends the leg is the | quadriceps femoris
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| muscle twitch | is a contraction of an entire muscle in response to a stimulus
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| the time of contraction is the | contraction phase
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| the muscles that relaxes is the | relaxation phase
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| tetany | the condition where a muscle remains contraction without relaxing
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| aerobic resperation | occurs in the presence of oxygen
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| anerobic repiration | occurs in the absence of oxygen
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| two types of muscle contractions | isotonic and isometric
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| the most stationary end of a muscle | head
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| two types of tongue muscles | intrinsic and extrinsic
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