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25 Cards in this Set

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