Define motor unit, twitch vs. tetanic contraction, isotonic vs. isometric contractions. Describe the two types of isotonic contractions.
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Isometric Contraction(same length)
Is when muscle stays the same length, no movement.
Motor Unit
Muscle fibers are stimulated by a nerve fiber called a motor neuron
Isotonic Contraction(same tension)
The same tension, thus muscle length is changing. There are two possibilities muscle lengths and muscle shortens.
tetanic contraction
is a contraction due to many impulses, in rapid succession. Causes a smooth, steady contraction. Ex lock jaw
Twitch
is a contraction due to one nerve impulse. That causes a quick, jerky contraction.