Cellular Respiration

energy · cells · life science · oxygen

Energy from food. Your cells take nutrients like glucose (a type of sugar) and break them down in a controlled way. This releases the chemical energy trapped inside those molecules, kind of like how a battery releases electrical energy.

Oxygen's important job. Oxygen acts like the final destination for electrons in this energy-releasing process. When oxygen accepts these electrons, it combines with hydrogen to make water, one of your body's waste products.

Making ATP packets. The whole point of cellular respiration is to pack that released energy into molecules called ATP (adenosine triphosphate). Think of ATP as tiny rechargeable batteries that your cells use to power everything from muscle movements to thinking.

A whole system. Cellular respiration happens in stages throughout your cell, with some parts in the cytoplasm and others in special structures called mitochondria. Each stage captures a little more energy until nearly all the usable energy from your food has been stored in ATP.

Getting rid of waste. When your cells break down food, they produce carbon dioxide and water as waste products. You breathe out the carbon dioxide and your body gets rid of extra water through sweat and other means.