Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
A&P CH8 Key terms
A&P CH8 Muscular System
| Term | Definition |
|---|---|
| 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 |
Created by:
djhockett5