Question | Answer |
Tendon | connective tissue that surrounds each muscle |
Aponeuross | fibourous sheets |
Myofibrils | abundant parallel , thread-like structures. |
Myosin | Protein that causes muscle contraction. |
Actin | Protein that shortens muscle fibers. |
Sacromeres | structural and functional unit of a myofibril. |
Neurotransmitters | Chemical that an axon end secretes. |
Motor Neurons | Neuron that conducts impulses. |
Neuromuscular Junction | Synapse between a motor neuron and a skeletal muscle fiber. |
Acetylcholine | a type of neurotransmitter |
sliding filament model | muscles shorten, pulling on muscle ends |
ATPase | enzymes that transfer the energy. |
Acetylcholinesterse | Enzymes that catalyze breakdown |
Creatine phosphate | molecule in muscle that stores energy |
Myoglobin | Oxygen storing pigment in muscle tissue |
Lactic Acid Threshold | a shift in metabolism |
Oxygen Debt | amount of oxygen required by muscle cells |
Threshold Stimulus | stimulation level that must be reached. |
Twitch | brief contraction of a muscle fiber followed by relaxation |
muscle tone | on going contraction of fibers. |
Isometric | contraction that changes muscle length |
Levers | mechanical device |
Origin | end of muscle that attachments to unmovable parts. |
insertion | end of muscle attached to movable parts |
Agonist | a muscle that causes an action |
Synergists | a muscle that assists the action of agonists |
prime mover | muscle that provides most of the force for body movement |
antagonist | a muscle that opposes an action |