All the given minerals have a role in the contraction of muscles in the human body. Calcium: Calcium is essential for activating enzymes that cause muscle contraction. Iron: Iron helps support continued muscle function by supporting energy production in your muscle cells so that muscle fibers always have the energy they need to contract properly. Iron also helps muscles store oxygen to fuel muscle contractions and promotes healthy circulation so that muscles can get additional oxygen from the bloodstream. Sodium: One needs sodium for muscle contraction because it balances potassium to maintain membrane potential.