| A | B |
|---|
| actin | a protein in a amusscle fiber that together with myosin, is responsible for contraction and relaxation |
| antagonist | a muscle that acts in opposition to a prime mover |
| aponeurosis | a sheetlike tendon by which certain muscles are attched to other parts |
| fascia | a sheet of fibrous connective tissue that encloses the muscle |
| insertion | the end of a muscle that is attached to a movable part |
| motor neuron | a neuron that transmits impulses from the central nervous system to an affector |
| motor unit | a motor neuron and the muscle fibers associated with it |
| muscle impulse | the result of an impulse with passes in all directions over the surface of the muscle |
| myofibril | one of the contractile fibers found within muscle cells |
| myosin | a protein that together with actin, is responsible for muscular contraction or an impulse in another neuron |
| neurotransmitter | a chemical substance secreted by the terminal end of an axon that stimulates a muscle fiber contraction |
| origin | the end of a muscle that is attched to a relatively unmovable part |
| oxygen debt | the amount of oxygen that must be supplied following physical excersis to convert accumulated carbon |
| prime mover | a muscle that is mainly responsible for a particular body movement |
| recruitment | increase in the number of motor units activited as the intensity of stimulation increases |
| synergist | muscle that assists th action of a prime mover |
| threshold stimulus | the level of stimulation that must be exceeded to elicit a nerve impulse or a luscle contraction |
