2 Think, pair, share The word equation for respiration. Where aerobic respiration takes place in the cell.Why do cells need energy?
3 Energy in CellsCells need energy for; Cell division, growth, muscle contraction and synthesising large molecules. Where does this energy come from?
4 Energy in FoodHow do you know that there is energy present in the malteser?
5 The Respiration Equation Glucose + Oxygen Energy Carbon Water(ATP) DioxideFromOur foodCan be used forCell activity e.g.Muscle contraction
6 RespirationRespiration is a series of enzyme controlled reactions that releases the chemical energy stored in glucose.
7 ATPThe energy from glucose is used to form ATP by making a bond between ADP (adenosine di-phosphate) and Pi (inorganic phosphate).Energy from glucose
8 ATPATP carries the energy to a cell which needs energy and breaks down into ADP and Pi.Energy released from ATPThe energy released from the bond can be used in cell division, muscle contraction and making proteins.
9 The Energy Cycle ATP ADP + Pi ENERGY PUT IN Respiration Of glucose RELEASEDENERGYPUT INUsed forCellActivityRespirationOf glucose
10 Quick Questions What is respiration? What is the equation for respiration?What form does the energy take when it isreleased from food?4. What does ATP stand for?5. What can ATP be used for?
11 Aerobic Respiration Using Oxygen Breakdown of glucose to release energy in thepresence of oxygen is a two step process:Glycolysis: Glucose is split in two becomingpyruvic acid2. Breakdown of pyruvic acid into simple products
12 Stage 1: GlycolysisGlucoseSplittingGlucose (6 carbons)enzymecontrolled reactionsPyruvic Acid (3 carbons)How many molecules of pyruvic acid come from 1 molecule of glucose?
13 Stage 2: Breakdown of pyruvic acid Pyruvic acid oxygenenzymecontrolled reactionscarbon dioxide water
14 When is ATP produced? Glucose 2ADP + 2Pi 2ATP Pyruvic Acid + oxygen How many molecules of ATP are produced from 1 molecule of pyruvic acid?36 ADP + 36 Pi36 ATPcarbon dioxide water
15 2 ATP 36 ATP Total = 38 ATP ATP production Glucose Pyruvic Acid + oxygen36 ATPTotal = 38 ATPcarbon dioxide water
16 Total 2 ATP no oxygen Anaerobic Respiration in Plants and Yeast Glucose2ADP + Pi2ATPTotal2 ATPPyruvic AcidNo ATPEthanol and Carbon Dioxide
17 Effects of Lactic Acid in Muscle GlucosePyruvic Acid+ oxygenheavy exerciseBUILD UP OXYGEN DEBTrecovery periodOXYGEN DEBT REPAIDLactic acid
19 Produce a graph using the information below: Time (mins)Force (Newtons)4005380739010350183302029022300252627030240Explain why the force used by the muscle is decreasing.
20 Questions Define the term anaerobic respiration. Explain why lactic acid builds up in the muscles.Identify 2 conditions necessary for the oxygen debt to be repaid.Give 3 differences between the breakdown of a glucose molecule in a root cell which respires in;a) well aerated soil.b) anaerobically in flooded soil.