Presentation on theme: "Today’s Objective: SOL 3.d"— Presentation transcript:
1 Today’s Objective: SOL 3.d Given information and/or diagrams on cellular respiration, write and/or identify the cellular respiration equation, raw materials, products, and sites.
2 Energy for life’s activities Cellular RespirationEnergy for life’s activities
3 Overview of Cellular Respiration The life processes of all organisms require energy.The potential energy held in the bonds of food molecules CANNOT be used directly by the cell.Energy from food must be converted to the ONLY energy source that cells can use ATP!
4 Cellular RespirationRespiration is the process by which the energy in the bonds of nutrients are used to synthesize ATP.Respiration occurs continuously in all cells of all organisms.
5 Anaerobic Respiration Also called fermentationNo oxygen is present1 Glucose only partially broken down to form waste products and 2 ATP
6 Anaerobic Pathways Glucose 2 lactic acid + 2 ATP Happens in muscle cells when they run out of oxygenHappens in bacteria that make yogurt, cheese, dill picklesGlucose 2 ethanol + 2 CO2 + 2 ATPHappens in some bacteriaHappens in YEAST
7 Aerobic Respiration Has to have oxygen VERY EFFICIENT Most organisms on earth are aerobic1 glucose completely broken down to carbon dioxide and water.C6H12O6 + 6 O2 6 CO2 + 6 H2O + E
8 Aerobic Pathway Takes place mostly in mitochondria 3 primary steps: Glycolysis in cytoplasm: produces pyruvate and 2 net ATP (anaerobic)Kreb’s cycle in matrix of mitochondria: converts pyruvate to Acetyl-CoA (aerobic)Electron transport chain on membrane of mitochondria: moves electrons to produce 34 ATP (aerobic)
9 Comparing Aerobic & Anaerobic Cellular Respiration Pathways Aerobic (needs oxygen)Anaerobic(no oxygen)Occurs in:Most organismsMostly yeast and bacteria1 glucose makes:6 CO2 + 6 H2OEthanol + CO2 or lactic acidNet ATP production:362
10 Adaptations for Respiration Bacteria, protists & fungiRespiratory gases are exchanged by diffusionPlantsRespiratory gases are exchanged through leaves, stems, and rootsMoves in and out of cells by diffusion but leaves and stems also have openings to the environment (stomata and lenticels)
11 Adaptations for Respiration in Animals Techniques vary:Simple diffusion across cell membranesDiffusion across moist skin into a circulatory systemOpenings to the environment that can be flapped open and closed with a circulatory system to transport gasesSpecialized respiratory structures (e.g. lungs) to speed exchange of respiratory gases