Cellular Respiration in Detail KEY CONCEPT Cellular respiration is an aerobic process with two main stages.
Mar 27, 2015
Cellular Respiration in Detail
KEY CONCEPT Cellular respiration is an aerobic process with two main stages.
Cellular Respiration in Detail
Glycolysis is needed for cellular respiration.Glycolysis takes place in the cell’s cytoplasm• The products of glycolysis enter cellular respiration when
oxygen is available.– two ATP molecules are used to split glucose– four ATP molecules are produced (net gain of 2!!)– two molecules of NADH produced– two molecules of pyruvate produced
Cellular Respiration in Detail
Glycolysis is needed for cellular respiration.
• The products of glycolysis enter cellular respiration when oxygen is available.– The electrons from glucose are stored in NADH– ATP can be used as immediate energy
Cellular Respiration in Detail
The Krebs cycle is the first main part of cellular respiration.The Krebs cycle takes place inside the mitochondria• Pyruvate is broken down
in the cytoplasm before the Krebs cycle.– Pyruvate is broken down
into Acetyl CoA- carbon dioxide released
– NADH produced– coenzyme A (CoA) bonds
to two-carbon molecule to an molecule in the Krebs cycle
- The Krebs cycle begins
Cellular Respiration in Detail
• The Krebs cycle produces energy-carrying molecules.
Cellular Respiration in Detail
– After acetyl coA joins with the krebs cycle the cycle begins
– Citric acids is formed next– Electrons from citric acid
are stripped and stored on NADH and CO2 is released
– More electrons are stripped off and stored on NADH
– ADP is converted to ATP and more CO2 is released
– Once again, electrons are stripped off but this time they are stored on both NADH and FADH
• The Krebs cycle produces energy-carrying molecules.
Cellular Respiration in Detail
Summary: –Each pyruvate produces–3 CO2 (one when it’s converted to acetyl coA before krebs)–4 NADH (one when it’s converted to acetyl coA before krebs)–1 FADH–1 ATP
*******remember glucose produces 2 pyruvate, so all of the above totals are multiplied by 2********
• The Krebs cycle produces energy-carrying molecules.
Cellular Respiration in Detail
The electron transport chain is the second main part of cellular respiration.
• The electron transport chain uses NADH and FADH2 to
make ATP.
Cellular Respiration in Detail
• The breakdown of one glucose molecule produces up to38 molecules of ATP.
– ATP synthase produces ATP
– oxygen picks up electrons and hydrogen ions
– water is released as a waste product
The electron transport chain is the second main part of cellular respiration.
• The electron transport chain uses NADH and FADH2 to
make ATP.