Cellular Respiration Food to energy

Autotrophs Heterotrophs “Self-feeders” Plants and other organisms that make all their own organic matter from inorganic nutrients Heterotrophs “Other-feeders” Humans and other animals that cannot make organic molecules from inorganic ones

Harvesting Chemical Energy From photosynthesis we get carbohydrates (glucose) Cellular respiration: Breaking down the carbohydrates (glucose) Starts with glycolysis Glyco = sugar Lysis = breaking Breaking down sugars

Producers Biologists refer to plants and other autotrophs as the producers in an ecosystem Consumers Heterotrophs are consumers, because they eat plants or other animals Figure 6.2

Sunlight energy Ecosystem Photosynthesis (in chloroplasts) Glucose Carbon dioxide Oxygen Water Cellular respiration (in mitochondria) for cellular work Heat energy Figure 6.3

The Relationship Between Cellular Respiration and Breathing Cellular respiration and breathing are closely related Cellular respiration requires a cell to exchange gases with its surroundings Breathing exchanges these gases between the blood and outside air

The Overall Equation for Cellular Respiration A common fuel molecule for cellular respiration is glucose This is the overall equation for what happens to glucose during cellular respiration Glucose Oxygen Carbon dioxide Water Energy Unnumbered Figure 6.1

The Role of Oxygen in Cellular Respiration During cellular respiration, hydrogen and its bonding electrons change partners Hydrogen and its electrons go from sugar to oxygen, forming water