1. Overview of Cellular Respiration
Section 4.4
Overview of Cellular Respiration

2. Cellular Respiration makes atp by breaking down sugars
Cellular Respiration  releases chemical energy from sugars and other carbon-based molecules to make ATP (energy) when oxygen is present
Cellular Respiration can be aerobic or anaerobic:
Aerobic  oxygen is needed in order for cellular respiration to take place
Anaerobic  oxygen is not needed for cellular respiration to take place (sometimes)

3. Glycolysis Anaerobic process – it does not require oxygen
Glycolysis takes place in the cell’s cytoplasm
Glycolysis splits glucose into two 3-carbon molecules
Glycolysis produces 2 molecules of ATP (energy)

4. Krebs Cycle
The purpose of the Krebs Cycle is to produce molecules that carry energy to the last part of cellular respiration (electron transport chain)
The Krebs Cycle takes place in the mitochondrial matrix
The Krebs Cycle breaks down the 3-carbon molecules from glycolysis
The Krebs Cycle makes a small amount of ATP (energy) and releases carbon dioxide as a waste product
This cycle transfers the energy carrying molecules to electron transport chain

6. Electron transport chain
The Electron Transport Chain produces most of the ATP (energy) during cellular respiration
The Electron Transport Chain takes place in inner membrane of the mitochondria
The Electron Transport Chain needs energy-carrying molecules from the Krebs Cycle in order to start the process
ATP is produced during the Electron Transport Chain
A large number
Water and heat are released as by-products

8. Overall equation for cellular respiration
Chemical Energy Chemical Energy
(Glucose) (ATP)

9. How are photosynthesis and cellular respiration related?