The most powerful involuntary muscle is the heart, while the most powerful voluntary muscle is the tongue.

i believe it's the tounge. someone correct me if i'm wrong.

I would have to say it would be your hamstrings. It is one of the largest as voluntary muscles go. Hammies or maybe the glutes. For involuntary muscles, the heart. I know it is an organ but I thought I heard once that it is also a muscle.

The heart moves more mass and more weight overall, works continually, quite unlike any other muscle in the body.

I heard it's the jaw muscle, I believe it too.

Tongue. Largest is the quad I think.

Apparently, there are quite a few 'correct' answers to this question. Interesting, though, that the TONGUE, is NOT one of them! The 'strongest' human muscle Since three factors affect muscular strength simultaneously and muscles never work individually, it is unrealistic to compare strength in individual muscles, and state that one is the "strongest". Accordingly, no one muscle can be named 'the strongest', but below are several muscles whose strength is noteworthy for different reasons.   In ordinary parlance, muscular "strength" usually refers to the ability to exert a force on an external object—for example, lifting a weight. By this definition, the masseter or jaw muscle is the strongest. The 1992 Guinness Book of Records records the achievement of a bite strength of 4337 N (975 lbf) for 2 seconds. What distinguishes the masseter is not anything special about the muscle itself, but its advantage in working against a much shorter lever arm than other muscles.   If "strength" refers to the force exerted by the muscle itself, e.g., on the place where it inserts into a bone, then the strongest muscles are those with the largest cross-sectional area. This is because the tension exerted by an individual skeletal muscle fiber does not vary much. Each fiber can exert a force on the order of 0.3 micronewton. By this definition, the strongest muscle of the body is usually said to be the quadriceps femoris or the gluteus maximus.   A shorter muscle will be stronger "pound for pound" (i.e., by weight) than a longer muscle. The myometrial layer of the uterus may be the strongest muscle by weight in the human body. At the time when an infant is delivered, the entire human uterus weighs about 1.1 kg (40 oz). During childbirth, the uterus exerts 100 to 400 N (25 to 100 lbf) of downward force with each contraction.   The external muscles of the eye are conspicuously large and strong in relation to the small size and weight of the eyeball. It is frequently said that they are "the strongest muscles for the job they have to do" and are sometimes claimed to be "100 times stronger than they need to be." However, eye movements (particularly saccades used on facial scanning and reading) do require high speed movements, and eye muscles are 'exercised' nightly during Rapid eye movement.   The unexplained statement that "the tongue is the strongest muscle in the body" appears frequently in lists of surprising facts, but it is difficult to find any definition of "strength" that would make this statement true. Note that the tongue consists of sixteen muscles, not one. One plausible explanation for this statement is that it originally referred to "tongue" as a metonymy for language, much like "The pen is mightier than the sword."   The heart has a claim to being the muscle that performs the largest quantity of physical work in the course of a lifetime. Estimates of the power output of the human heart range from 1 to 5 watts. This is much less than the maximum power output of other muscles; for example, the quadriceps can produce over 100 watts, but only for a few minutes. The heart does its work continuously over an entire lifetime without pause, and thus does "outwork" other muscles. An output of one watt continuously for seventy years yields a total work output of two to three gigajoules. http://en.wikipedia.org/wiki/Muscle

I believe it's the heart, think that's what we learned in school...

the tongue?

The most "powerful" muscle in the human body is often the Quadriceps femoris. This is because power is a combination of speed and strength, and this muscle has the strongest "pulling" force of the actual muscle. Because of this, and its length it can move fast, whilst applying a large force to extend the knee joint. You could say that the "Maosseur" or "Jaw" muscle is the most powerful because It can produce the most force to an external object. However the muscle itself is not particually strong and relys on a leverage to apply a large force to the jaw. However because of this it can only move relatively slowly compaired to the Quadriceps femoris, so I say that the Quadricep Femoris is the winner! I cant see the toungue being the most powerful either-how silly??

I would think it would be the heart. It's certainly a very 'busy' muscle LOL

I think it's the tongue.

i think its Thigh !