Final answer:
Humans release energy through metabolism, which converts chemical energy from food into different forms of energy. These forms include chemical, mechanical, radiant, and electrical energy.
Step-by-step explanation:
Humans release energy through a process called metabolism. Metabolism converts the chemical energy from food into different forms of energy that are essential for human functioning. These forms of energy include chemical energy, which is stored and released as chemical bonds are formed and broken; mechanical energy, which directly powers physical activity; radiant energy, emitted as waves such as in sunlight; and electrical energy, the power of moving electrons.