Anatomy Chart courtesy of FCIT
The Bicep gets it's name from these two heads - called the short head and the long head.
The Biceps runs down the anterior or front side of the humerus and makes up approximately 1/3 of the muscle mass of the upper arm.
The Biceps are among the most famous muscles in the body. When somebody asks you to "make a muscle", they aren't asking you to flex your hamstrings. They want to see your biceps!