Final answer:
ATP is a molecule that stores and releases energy for cellular processes in living things. It is often referred to as the 'energy currency' of the cell. ATP is used in various processes, such as muscle contraction, active transport, and synthesis of macromolecules.
Step-by-step explanation:
The function of ATP in living things is to provide energy for cellular processes. ATP stands for adenosine triphosphate, which is a molecule that stores and releases energy when needed. It is often referred to as the 'energy currency' of the cell because it is used to power various reactions and activities within cells.
ATP is made up of three phosphate groups, a ribose sugar molecule, and an adenine base. When ATP is broken down into ADP (adenosine diphosphate) and an inorganic phosphate molecule, energy is released. This energy is used by cells for processes such as muscle contraction, active transport, and synthesis of macromolecules.
For example, during muscle contraction, ATP provides the energy needed for myosin heads to attach to actin filaments and pull them closer together. This process requires ATP to break the cross-bridges between myosin and actin, and then to reattach them, allowing for repeated muscle contractions. Without ATP, this process would not be possible.
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