Muscular tissue makes up 35-40 percent of our body weight and comes in several types of packages — skeletal, cardiac and smooth. Most sources state that there are over 650 named skeletal muscles in the human body, although some figures go up to as many as 840. The dissension comes from those that count the muscles within a complex muscle. For example the biceps brachii is a complex muscle that has two heads and two different origins however, they insert on the radial tuberosity. Although most individuals have the same general set of muscles, there is some variability from one person to another. Generally, smooth muscles are not included with this total since most of these muscles are at cellular level and number in the billions. In terms of a cardiac muscle, we only have one of those - the heart.

More Info: