What is the strongest muscle tissue?

Since three factors affect muscular strength simultaneously and muscles never work individually, it is misleading to compare strength in individual muscles, and state that one is the "strongest".
1) physiological strength (muscle size, cross sectional area, available crossbridging, responses to training)
2) neurological strength (how strong or weak is the signal that tells the muscle to contract)3)mechanical strength (muscle's force angle on the lever, moment arm length, joint capabilities)

These are few of the strongest muscles
-In lifting weights the jaw muscle is the strongest
-The tongue is also considered as one of the strongest muscle, this could be true, but it is hard to say as the tongue is made up of 6 muscles
-The heart has a claim to being the muscle that performs the largest quantity of physical work in the course of a lifetime.