"How Cells Obtain Energy" explains how cells capture, store, and use energy through ATP, the universal energy carrier. The video introduces cellular respiration in mitochondria, showing how sugars and fats are broken down, how oxygen increases ATP production, and how ATP synthase converts ADP to ATP. It also connects these ideas to photosynthesis in chloroplasts, where light energy, chlorophyll, thylakoids, and the Calvin Cycle help produce glucose and oxygen. Key biology concepts include active transport, chemical bond energy, mitochondria, chloroplasts, ATP, ADP, cellular respiration, photosynthesis, and carbon dioxide cycling. This overview supports life science curricula focused on cell structure and function, energy transformation, and the relationship between plants and animals in living systems. Part of the "Inside the Living Cell" series. Accessibility options on the DVD are: (1) expanded description, (2) English subtitles in a black box, (3) subtitled description.