The Key Role of Calcium and ATP in Muscle Contraction
                                
                                
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                                    5 min read                                
                            
                                According to the National Institutes of Health, skeletal muscle makes up about 40% of the human body's weight. At a cellular level, the essential process that plays a key role in the contraction of muscles relies on a precise choreography of molecules, primarily involving calcium ions and the energy-carrying molecule ATP.