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A&P CH8 Key terms

A&P CH8 Muscular System

TermDefinition
actin a protein that, with myosin, contracts muscle fibers
antagonist a muscle that acts in opposition to a prime mover
aponeurosis a sheet of connective tissue by which certain muscles are attached to adjacent muscles
fascia a sheet of fibrous connective tissue that encloses a muscle
insertion the end of a muscle attached to a movable part
motor neuron a neuron that transmits impulses from the central nervous system to an effector
motor unit a motor neuron and its associated muscle fibers
muscle impulse impulse that travels along the sarcolemma to the transverse tubules
myofibril contractile fibers within muscle cells
myosin a protein that, with actin, contracts and relaxes muscle fibers
neurotransmitter chemical that an axon end secretes to stimulate a muscle fiber to contract or a neuron to fire an impulse
origin end of a muscle that attaches to a relatively immovable part
oxygen debt the amount of oxygen required after physical exercise to convert accumulated lactic acid to glucose
prime mover muscle responsible for a particular body movement
recruitment increase in number of motor units activated as stimulation intensity increases
sarcomere the structural and functional unit of a myofibril
synergist a muscle that assists the action of a prime mover
threshold stimulus stimulation level that must be exceeded to elicit a nerve impulse or a muscle contraction
 



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