
Being the basic unit of energy, ATP is used for all kinds of activities in the body. The relevance of ATP in our lives is evident if we break down our activities - we perform activities, and require energy for every single activity we perform. ATP is the unit for all this energy. In the human context, it is the most widely distributed compound in our body.
Three different usages of ATP are - building of complex molecules within the body, generating electricity within the nerves that comprise our nervous system, and also expansion and contraction of the muscles in our muscular system.