What to look for in a prenatal vitamin. Prenatal vitamins are available by both over-the-counter and by prescription. Although formulations can vary from brand to brand, these are the most important vitamins and minerals to look for:
Muscle pairs. Antagonistic pairs of muscles create movement when one (the prime mover) contracts and the other (the antagonist) relaxes. Examples of antagonistic pairs working are: 1  the quadriceps and hamstrings in the leg.2  the biceps and triceps in the arm.uscle pairs. Antagonistic pairs of muscles create movement when one (the prime mover) contracts and the other (the antagonist) relaxes. Examples of antagonistic pairs working are: 1  the quadriceps and hamstrings in the leg.
The antagonist of the muscle, biceps brachii is triceps brachii. Most muscles work in pairs, so MOST of the time, the antagonist is the one that is doing OPPOSITE of what IT iâ¦s doing. Like when the biceps contracts, the triceps relaxes, when the triceps contract, the biceps relaxes.