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Megan Williams


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



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