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25 Cards in this Set
- Front
- Back
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a movement that decreases the angle of the joint and brings two bones closer together
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flexion
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a movement that increases the angle, or the distance, between two bones
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extension
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a movement of bone around a longitudinal axis
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rotation
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moving a limb away from the midline of the body
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abduction
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moving a limb toward the midline of the body
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adduction
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a muscle named for the direction of muscle fibers
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rectus adominus
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a muscle named for its relative size
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gluteus maximus
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a muscle named for its location
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zygomaticus
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a muscle named for the location of origin and insertion
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sternocleidomastoid
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a muscle named for its shape
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deltoid
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a muscle named for its action
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adductor
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connective tissue enclosing each muscel fiber
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endomysium
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connective tissue enclosing several muscle fibers
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perimysium
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bundle of muscle fibers
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fascile
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connective tissue binding many fasciles together to form entire muscle
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epimysium
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sarcoplasmic reticulum
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specialized smooth ER that stores calcium
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What is a sarcomere?
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a unit of muscle cell from z disc to z disc
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complex organelle composed of bundles of myofilaments
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myofibril
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plasma membrane of a skeletal muscle cell
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sarcolemma
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the junction between the neuron and the muscle cell
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neuromuscular junction
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gap between the nerve ending and muscle cell membrane
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synaptic cleft
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chemical released when nerve impulse reaches the axonal terminals
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neurotransmitter called ACh
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When the ACh bonds with the receptors on the muscle cell, what happens?
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the sarcolemma becomes permiable to sodium ions, which rush into the muscle cell
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How does a muscle react to different stimuli using graded reponses?
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changing frequency of muscle stimulation, or the number of muscle cells being stimulated
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How does calcium assist in muscle contraction?
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calcium binds with the proteins on the actin filaments, allowing myosin filaments to attach
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