Considering the relationship between the biceps and the triceps, the biceps is the whereas the triceps is the as the elbow is flexed.

Considering the relationship between the biceps and the triceps, the biceps is the prime mover whereas the triceps is the antagonist as the elbow is flexed.

Explanation:

Prime mover is the muscle which is the cheif muscle or member of cheif group of muscles for a particular movment as biceps is when the elbow is flexed. While Antagonist is the muscle which opposes the movement of the prime mover as triceps is , when the elbow is felxed. Before a prime mover can contratc, the antagosnist muscle must be equally relaxed.

enzyme speed up the reactions