A single motor neuron may synapse with one or more muscle fibers. The motor neuron and all of the muscle fibers to which it connects is a motor unit. Motor units are split up into 3 categories: slow motor units, fast fatiguing motor units, and fast fatigue-resistant motor units.
- Slow motor units are used to stimulate small muscle fibres which contract very slowly and provide small amounts of energy but are very resistant to fatigue, so they are used to sustain muscular contraction such keep the body upright.
- The Fast Fatiguing motor units are used to stimulate larger muscle groups which apply large amounts of force but fatigue very quickly. They are used for tasks that requires large brief bursts on energy such as jumping or running.
- The Fast Fatigue-Resistant motor unit stimulate moderate sized muscles groups that don't react as fast as the FF motor units, but can be sustained much longer, as implied by the name, and provide more force that the S motor unit.
Read more about this topic: Motorneuron
Other articles related to "motor unit, motor units, units":
... The distribution of motor unit size is such that there is an inverse relationship between the number of motor units and the force they generate (i.e ... the number of muscle fibers per motor unit) ... Thus, there are many small motor units and progressively fewer larger motor units ...
... For more details on this topic, see #Types of motor units ... A motor unit takes a supply of steam at high pressure and temperature and gives out a supply of steam at lower pressure and temperature, using as much of the ... Motor units are typically a type of piston or steam turbine ...
... Following their success, NSB took delivery of a series of motor units ... The first three units were delivered in 1938 one with DWK engine (no ... A further ten units were delivered in 1940, split between the c and d-series (no ...
... There are at least six techniques that are currently in use to estimate motor unit numbers ... According to Henneman's size principle, motor unit recruitment is always in the same order from smallest to largest motor unit ... Additionally, the motor unit action potential is an all-or-none phenomenon - once the recruitment threshold (the stimulus intensity at which a motor unit begins to fire) is reached, it fires ...
Famous quotes containing the words units and/or motor:
“Even in harmonious families there is this double life: the group life, which is the one we can observe in our neighbours household, and, underneath, anothersecret and passionate and intensewhich is the real life that stamps the faces and gives character to the voices of our friends. Always in his mind each member of these social units is escaping, running away, trying to break the net which circumstances and his own affections have woven about him.”
—Willa Cather (18731947)
“This biplane is the shape of human flight.
Its name might better be First Motor Kite.”
—Robert Frost (18741963)