2 Overview of Cellular Respiration Living organisms obtain energy by breaking down organic molecules during cellular respiration.It is a catabolic pathway in which organic molecules are broken down to release energy for use by the cell.
3 The equation for cellular respiration is the opposite of the equation for photosynthesis.
4 The Reactants of Cellular Respiration are: Glucose (C6H12O6) – eat Cellular EnergyThe Reactants of Cellular Respiration are:Glucose (C6H12O6) – eatOxygen (O2) – breathe inThe Products of Cellular Respiration are:Heat – released throughout your bodyCarbon Dioxide (CO2) – breathe outWater (H2O) – breathe out
5 Cellular respiration occurs in two main stages: Cellular EnergyCellular respiration occurs in two main stages:Glycolysis – occurs in the cytoplasmAerobic respiration – occurs in the mitochondria
6 GlycolysisThe splitting of glucoseOccurs in the cytoplasmDoes not require oxygen
7 GlycolysisFinal products of glycolysis for each molecule of glucose are:2 ATP’s2 molecules of NADH2 molecules of pyruvate for each glucose molecule that is broken down4 molecules of ATP are actually produced when glucose is split, but the energy from 2 of those are needed for the reactions to take place.
8 Cellular EnergyAerobic RespirationIn aerobic respiration, oxygen is used to break down glucose molecules.As a result 36 ATP can be made from 1 glucose molecule.Aerobic respiration follows glycolysis and occurs inside the mitochondria.The 2 pyruvate molecules are transported to the mitochondria.
9 Cellular EnergyTwo pyruvate molecules from glycolysis is transformed into acetyl CoA and enters the Krebs cycle.
11 Krebs Cycle (sometimes referred to as the citric acid cycle) Cellular EnergyKrebs Cycle (sometimes referred to as the citric acid cycle)Series of reactions in which pyruvate is broken down into carbon dioxide.There are two “turns” of the Krebs cycle for each glucose molecule. Why?
12 Krebs cycle results in the net production of: Cellular EnergyKrebs cycle results in the net production of:8 NADH2 FADH22 ATP6 CO2
13 Electron Transport Chain Cellular EnergyElectron Transport ChainNADH & FADH2 enter electron transport chain in mitochondria cristae.High energy electrons and hydrogen ions from NADH and FADH2 produced in the Krebs cycle are used to convert ADP to ATP.
14 Electron Transport Chain Oxygen is the final acceptor of electrons. Cellular EnergyElectron Transport ChainOxygen is the final acceptor of electrons.Protons and electrons are transferred to oxygen to form water.Produce 32 more ATP.
16 Anaerobic Respiration Cellular EnergyAnaerobic RespirationThe first step in anaerobic respiration is also called glycolysis.Anaerobic = without oxygenPlant and animal cells cannot survive off of anaerobic respiration.Not very efficient
17 Anaerobic Respiration Cellular EnergyAnaerobic RespirationThere are 2 types of anaerobic respiration:Lactic acid fermentationA process that occurs in animal cellsCauses your muscles to burn when you perform short bursts of activityAlcohol fermentationA process that occurs in plantsThis is how alcohol, such as wine and beer, is made
20 Review the two equations for photosynthesis and cell respiration. They are reversed!
21 Cellular Respiration & Photosynthesis are Interrelated Cellular EnergyCellular Respiration & Photosynthesis are InterrelatedProducts for photosynthesis are oxygen and glucose, the reactants for cellular respiration.Cellular respiration uses O2 to break the sugars down and releases the CO2 back into the atmosphere to be used again by plants.
22 Cellular Respiration & Photosynthesis are Interrelated Cellular EnergyCellular Respiration & Photosynthesis are InterrelatedNotice! Molecules such as O2 and CO2 are recycled through the environment, however the energy is not!Energy enters our environment as light and leaves back into outer space as heat.