Grade 9 Environmental Chemistry Practice Test

Magnesium is the mineral that helps absorb and use calcium by supporting how muscles work. It acts as a helper molecule (a cofactor) for enzymes that control energy production and calcium metabolism, and it helps muscles contract and relax properly. Without enough magnesium, calcium can’t be used efficiently, which can lead to cramps or weakness. Foods such as watermelon and green onions contain magnesium, along with many other nuts, seeds, and leafy greens. Calcium itself triggers muscle contraction, but it relies on magnesium to be absorbed and used correctly. Phosphorus is important for bones and energy storage, but it doesn’t directly assist calcium absorption into muscle tissue. Sodium mainly regulates fluid balance and nerve signaling, not the SAMPLEspecific calcium–muscle interaction.