The energy needed for cellular tasks is primarily provided by adenosine triphosphate (ATP). ATP acts as the energy currency of the cell, storing and transporting chemical energy necessary for various biological processes, including muscle contraction, protein synthesis, and cellular respiration. When ATP is hydrolyzed, energy is released, enabling cells to perform work. The continual regeneration of ATP from adenosine diphosphate (ADP) and inorganic phosphate through cellular respiration allows cells to maintain their energy balance and sustain life.