Overview of Cellular Respiration Section 4.4 Overview of Cellular Respiration

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)

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)

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

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

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

How are photosynthesis and cellular respiration related?