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.
movement. Muscles that work together are called agonists or synergists. Muscles that work in opposition to another are called antagonists. In arthropods, locomotion is accomplished by muscles that work against the exoskeleton they are attached to.ovement. Muscles that work together are called agonists or synergists. Muscles that work in opposition to another are called antagonists. In arthropods, locomotion is accomplished by muscles that work against the exoskeleton they are attached to.