the bicep contracts in a concentric contraction which means the muscles has shortened. remember muscles can only pull they can not push. also the bicep curl can be described as elbow flexion and when the weight is lowered is called elbow extention.
hope it helps
The movement is extension of the arm.
The prime mover is the triceps brachi.
brachialis
Bicep Femoris
Prime mover is the bicep and the antagonist is the tricep.
Biceps and brachioradialis. The bicep is the prime mover in elbow joint movement and the brachioradialis acts as a synergistic muscle to stabilize the joint, thus aiding in the motion.
Muscles cannot push, they can only pull which means they work in pairs in order to move, this is known as antagonistic pairs. For example with a bicep curl you have the agonist/ prime mover (Bicep) and the antagonist/ Opposing muscle group (Triceps). As the agonist contracts it pulls the antagonist which relaxes.
The bicep curl obviously helps the Bicep but it also helps you triceps as you pull your fist towards you your are contracting your bicept and relaxing your tricep
The preacher curl in my opinion is the best bicep exercise.It is better than barbell curl because barbell curl works bicep brachii but it does not give enough work to brachialis muscle.Preacher curl works both Bicep brachii and brachialis.First Mr.Olympia Larry "The legend"Scott used to do Preacher curl and he developed 20' inch Arm.
if you're speaking anatomically (as in origin and insertion), the origin of the bicep curl would be its fixed attachment at the supraglenoid tubercle and the coracoid process (two heads), as a bicep curl is an open chain motion (distal end is free moving --> proximal end is the origin). it would be more correct, though, to say refer to it as the origin of the biceps during a bicep curl.
Preacher Curl Bicep Curl Chin-up
60cm-24"
thunder and lightening
hammer curl targets the bicep branchi and preacher curl targets the lower area of biceps..
The Main muscles used when you do elbow curls are the bicep muscles.