How do cells make energy?
Glycolysis, the Krebs cycle and the electron transport chain: about 30 ATP from one glucose.
Transcript
Cells burn glucose with oxygen to release energy, and store it as A T P.
In the cytoplasm, glycolysis splits glucose into two pyruvate.
It nets two A T P, and needs no oxygen.
Inside the mitochondrion, pyruvate is broken down by the Krebs cycle.
Carbon leaves as carbon dioxide, and carriers pick up high energy electrons.
Electrons pass along the electron transport chain, pumping protons across a membrane.
Protons flow back through A T P synthase, making most of the A T P, while oxygen takes the electrons and forms water.
One glucose yields about thirty A T P, roughly fifteen times more than without oxygen.
Glucose and oxygen in. Carbon dioxide, water, and energy out. That is cellular respiration.
