The Oxygen Cycle
- 2. OXYGEN is a colorless gas that makes up 21 percent of Earth's atmosphere. Because it's all around, oxygen is easy to dismiss as dull and inert; in fact, it's the most reactive of the non-metallic elements. O! I am OXYGEN!
- 3. All living things use oxygen or depend on organisms that use oxygen in some way.
- 4. We use oxygen to break down simple sugar and release energy. This can be done through respiration or fermentation.
- 5. Animals mainly use respiration too.
- 6. WHAT IS RESPIRATION? It occurs inside the cell. The process that breaks apart molecules to release energy. It is What YOU do with the oxygen you take in.
- 7. We break down food into smaller molecules during digestion. One of the small molecules is glucose. Glucose leaves your intestines, goes into your blood and is taken to every cell in your body
- 8. We break down food into smaller molecules during digestion. One of the small molecules is glucose. Glucose leaves your intestines, goes into your blood and is taken to every cell in your body
- 9. Majority of the cellular respiration happens inside the mitochondria Mitochondria
- 10. CELLULAR RESPIRATION GLYCOLYSIS Glucose Pyruvate CYTOPLASM PREPARATORY REACTION Acetyl CoA CITRIC ACID CYCLE ELECTRON TRANSPORT CHAIN NADH NADH NADH & FADH2
- 12. Plants use cellular respiration to convert the energy stored in the form of glucose into a usable chemical energy
- 13. IN RESPIRATION… Plants uses oxygen, glucose and produces carbon dioxide, water and energy. During respiration, carbon is attach to the O2 and release CO2 so it can be used for photosynthesis.
- 14. IN PHOTOSYNTHESIS… Plants take in carbon dioxide, water and sunlight and use them to make food. Their food is simple sugar — glucose.
- 15. Plants pull the carbon off CO2 and use the carbon in glucose, freeing the oxygen so it can be used for respiration. (They do not need the oxygen for this. They get that from water, H2O.) GLUCOSE C6H12O6
- 17. Is it good to sleep under a tree at night?
- 18. Basic idea about the Oxygen Cycle Man eats food, breaks it down and releases CO2 through respiration. Man gives off CO2, which is taken in by the plant. Plant uses CO2 to make food. Plant gives off O2, which is taken in by the man
- 19. This happens on land and in the water. Algae and aquatic plants produce food underwater through photosynthesis.
- 20. They use CO2 dissolved in the water. Other aquatic organisms use the dissolved oxygen these plants release into the water.
- 21. One big cycle — all living things depend on each other for it to work!
- 22. We keep destroying natural areas, especially forested areas with many plants and replacing them with buildings, parking lots, lawns, etc. Fewer plants mean less oxygen and more carbon dioxide. This disturbs the balance of the natural cycle.