It kind of depends on your definition of strength, but in terms of “the ability to exert a force on an external object” (http://www.ask.com/web?q=strongest+upper+body+muscle&qsrc=0&o=0&l=dir), the strongest muscle is considered to be the jaw muscle, also called the masseter. One record shows the strongest bite as being 975lbf for a length of two seconds time.
Musuclar “strength” usually refers to the ability to exert a force on an external object. By this definition, the jaw is the strongest. The 1992 Guiness Book of Records records the achievement of a bit strenght of 4,337 N for 2 seconds. Its advantage is being able to work against a much shorter lever arm than other muscles.
There are claims tat the hear is the muscle that performs the largest quanitty of physical work in the course of al ifetime. It does work continuously over an entire lifetime without pause and “outworks” other muscles.
The term strongest muscle is really up to interpretation.
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