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Antagonist

muscle responsible for movement opposite of prime mover

Atrophy

muscle decreases in size, strength, number of fibers

Cardiac muscle

involuntary, striations

Cramp

muscle contracts spasmodically but does not relax completely

Endomysium

fascia that surrounds each muscle fiber

Epimysium

fascia that surrounds entire muscle

Fiber

single muscle cell

Hemoglobin

carries the oxygen to the body cells

hypertrophy

exercising muscles until they enlarge

insertion

attached to the movable part of the bone

myofibril

thick or thin protein filaments (myosin or actin)

myoglobin

found in muscle cells, temporarily stores oxygen

origin

attached to the stationary end of a bone

perimysium

separates muscles into bundles

prime mover

muscle most responsible for movement

sarcolemma

cell membrane

sarcoplasm

cytoplasm that contains nuclei, mitochondria, myofibrils

skeletal muscle

voluntary, striations

smooth muscle

involuntary, no striations

synergist

muscle that aids prime mover

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