Final answer:
Calcium is the essential mineral required for proper muscle contraction, as it facilitates the interaction between muscle fibers and proteins that trigger contraction.
Step-by-step explanation:
The mineral necessary for proper muscle contraction is Calcium (C). Calcium plays a crucial role in the body's ability to contract muscles, conduct nerve impulses, and clot blood.
When a muscle cell receives a signal, calcium ions rush into the cell and bind with proteins to initiate contraction. The concentration of calcium ions needs to remain at an optimal level for these functions to occur effectively.
Neither Cesium, Aluminum, nor Selenium is directly involved in muscle contraction to the extent that Calcium is.