Khan Academy Static

Variations_on_cellular_respiration

There's more than one way to extract energy from a fuel molecule! Learn how cells break down fuels without oxygen, how non-glucose molecules can enter cellular respiration, and how cellular respiration is regulated.

Pyruvate_oxidation_and_the_citric_acid_cycle

Glycolysis can extract a bit of the energy from a glucose molecule, but the citric acid cycle can squeeze out much more. Learn about the steps of the cycle, how it harvests energy, and how it's fueled by acetyl CoA (produced by oxidation of pyruvate from glycolysis).

Introduction_to_cellular_respiration

How does your body get usable energy from the snack you just ate? Learn the basics of how cells extract energy from fuel molecules, including what redox reactions are and why they are important in the breakdown of fuels.

Oxidative_phosphorylation

Oxidative phosphorylation produces most of the ATP made in cellular respiration. Learn more about how oxidative phosphorylation uses electron transport to drive ATP synthesis.

Glycolysis

The name glycolysis means "sugar-splitting," and sure enough, this metabolic pathway splits glucose into two three-carbon molecules. Learn more about the steps of glycolysis and how it is used in both cellular respiration and fermentation.

Cellular_respiration_skill_check

Check your understanding of cellular respiration!

Steps_of_cellular_respiration

Before you jump into the nitty-gritty details, get the big picture of cellular respiration. Learn about the different stages of this process and how they fit together.