Step-by-Step Respiration
Respiration is a catabolic process: enzymes break glucose down in small steps and the energy released is stored as ATP.
Glucose + oxygen → carbon dioxide + water + energy (ATP). About 60% efficient because glucose is fully broken down.
Stage 1: Glycolysis
In the cytosol, one 6-carbon glucose molecule is broken into two 3-carbon pyruvic acid molecules. No oxygen is needed, so glycolysis is anaerobic. It gives a net gain of 2 ATP and forms 2 NADH.
ATP total so far
Aerobic respiration releases far more energy per glucose because glucose is completely broken down
Build the respiration pathway
Drag each item into the correct stage or location, or tap an item then tap a box.
Glycolysis (cytosol)
stage 1, no oxygen needed
Mitochondrial matrix
stage 2, needs oxygen
Inner mitochondrial membrane
where most ATP is made
Fermentation products
no oxygen available