Anatomy
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| Muscle Cells | Muscle Fibers
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| Muscle responsible for smiling? | zygomaticus
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| What is contractility? | Ability of muscle to shorten with force
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| What is excitability? | Capacity of muscle to respond to a stimulus
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| What is extensibility? | Ability to be stretched
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| What is elasticity? | Ability to recoil after they have been stretched
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| Each skeletal muscle is surrounded by a connective tissue sheath called | epimysium
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| Connective tissue located outside the epimysium that surrounds and separates muscles | fascia
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| Loose connective tissue surrounding muscle fasciculi | perimysium
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| Single muscle cells | fibers
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| Connective tissue sheath surrounding each fiber | endomysium
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| Threadlike structure that extends from one end of the fiber to the other | myofibrils
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| Thin myofilaments | actin myofilaments
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| Thick myofilaments | myosin myofilaments
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| Actin and myosin myofilaments form highly ordered units called | sarcomeres
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| The charge difference across the membrane is called | 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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| Branches of neurons that connect to muscle form what? | 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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| Enlarged nerve terminal | presynaptic terminal
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| Space between the presynaptic teriminal and the muscle cell | synaptic cleft
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| Each presynaptic terminal contains? | synaptic vesicles
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| Synaptic vesicles secrete? | acetylcholine
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| Sliding of actin myofilaments past myosin myofilaments during contaction | sliding filament mechanism
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| Contraction of entire muscle | Muscle twitch
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| Time of contraction | contraction phase
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| Time of relaxation | 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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| Anaerobic respiration | without oxygen
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| Aerobic respiration | with oxygen
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| ATP is used during muscle contraction faster than it can be produced | muscle fatigue
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| Muscle fibers that fatigue quickly | Fast-twitch
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| Muscle fibers that are resistant to fatigue | Slow-twitch
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| Most stationary end of the muscle | origin
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| Portion between the origin and insertion | belly
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| Muscles that work opposite of each other | antagonists
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| The end of the muscle attached to the bones undergoing the greatest movement | insertion
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| Muscles that work together | synergists
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| Action of a flexor? | flexes muscle
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| Occipitofrontalis | raises the eyebrows
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| Orbicularis oculi | closes the eyelids
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| Orbicularis oris | puckers the mouth
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| Buccinator | flattens the cheek
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| Zygomaticus | smiling
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| Levator labii superioris | sneering
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| Depressor anguli oris | frowning
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| Muscle that changes tongue's shape | intrinsic tongue muscles
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| Muscle that moves the tongue | Extrinsic tongue muscles
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| Movement of triceps brachii? | extends forearm
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| Movement of biceps brachii? | flexes or suppinates forearm
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| Movement of flexor carpi | flexes wrist
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| Movement of extensor carpi | extends wrist
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Created by:
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