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It's called muscular "tension." .
muscle tone
It is called concentric isotonic contraction.
True Tension may build to the muscles peak tension capacity, but the muscle neither shortens or lengthens example. trying to lift a car
Disentration
complete tetanus
An isometric contraction is the name given to a skeletal muscle that does not shorten, but increases tension. The muscles generate force to protect themselves.
It's called tinea and usually associated with muscle tension around the ear.
hemoglobin like compound that stores oxygen in muscles
muscle tone
tension
The tension in a muscle spindle is maintained by flower spray endings. This is created by contraction of actin and myosin filaments.