If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

About this unit

Why do we need oxygen? How do we form carbon dioxide? Learn about cellular respiration, glycolysis, aerobic respiration, the electron transport chain and more. This unit is aligned to the Class 11 NCERT curriculum.