There are three stages of cellular respiration: glycosis, the citric acid cycle, and the
electron transport chain.
- Glycosis is the series of chemical reactions that occur in the cytoplasm. This process
breaks down glucose into simpler substances. In glycosis, six carbon molecules make two sets of three carbon molecules.
This process uses two molecules of ATP. The product of glycosis is four molecules of ATP and one of NADH.
Cytosol helps to control the cell's metabolism because of the proteins found in it.
- The citric acid cycle (Krebs cycle) is a series of chemical reactions that break down glucose
and produce ATP. It occurs in the mitochondria. One of the sets of the three-carbon molecules travel
over to the mitochondria. On the way there, one carbon molecule breaks off and detaches. The now two-carbon
molecule joins up with four carbons to make citric acid. One molecule of ATP is released (one per
turn), followed by one molecule of NADH and one molecule of carbon dioxide. After, two more molecules of NADH are released,
one molecule of FADH2, and on molecule of carbon dioxide. NADH and FADH2 are both energy carriers
in the form of Hydrogen and electrons. Therefore, the products of this chemical reaction is three molecules of NADH, one molecule
of ATP, and one molecule of FADH2.
- The third step of respiration is the electron transport chain. The electron transport
chain is located in the mitochondrial matrix. The electron transport chain has a pathway for all the
electrons to travel. The NADH and FADH2 go into the mitochondrial matrix and drop off the energy they were carrying. When
they lose their energy, they become NAD and FAD, respectively. Each time the electron moves, it loses one hydrogen ion.
When the electrons reach their destination, the final equation is O2 + H2 > H2O.
process of cellular respiration results in 36 ATP molecules made