The biseps are the upper front muscles of your arm. They connect your elbow and your shoulder. Bi means 2 so the biseps are made of 2 muscles. Triseps are the back upper muscles of your arm and because tri means 3, the triseps are made of 3 muscles.
well i dont know how you het bigger biseps :)
Start by learning how to spell biceps
biceps brachii,corahobrachialis,biseps
Biceps function to lift your forearm up to touch your shoulder. They are often used in cooperation with the muscles in your back to lift heavy objects.
I would think that instead of using your bisepts or triseps, in judo you have more use of you shoulders and back. This is only my oppinion, I have been diong judo for 7 years. But in saying this having powerfull biseps do wonders.