The Krebs Cycle and Electron Transport

Glycolysis Review Glycolysis is the process of taking one molecule of glucose and breaking it down into 2 molecules of pyruvic acid – – – When glycolysis is over, the presence of oxygen is determined –If no  –If yes 

Flowchart Section 9-2 Glucose (C 6 H ) + Oxygen (0 2 ) Glycolysis Krebs Cycle Electron Transport Chain Carbon Dioxide (CO 2 ) + Water (H 2 O) Cellular Respiration

Kreb’s Cycle  Pyruvic Acid loses a carbon atom in the form of carbon dioxide  This 2-carbon molecule will bind with Coenzyme A to form This molecule can now enter

Kreb’s Cycle During the Kreb’s cycle, pyruvic acid is broken down into _____________ in a series of energy-extracting reactions  Also known as the  Occurs in the

Mitochondria inter mitochondrial space = between 2 membranes

Kreb’s Cycle The Kreb’s Cycle will go through ______for each ____ molecule of pyruvic acid  Cycle goes through twice per 1 molecule of sugar Products: 88  2 – electron carrier 22 Used for cellular activities 66 Exhaled out Electrons are moved to the ETC

Electron Transport Chain: Overview Electrons from the electron carriers (NADH & FADH 2 ) are sent through a series of molecules to create   The electrons, once at the end of the chain, will attach to ________ ions and oxygen atoms to form _______  Occurs on the _______ membrane of the mitochondria

Electron Transport Chain: Details NADH & FADH 2 carry high energy electrons to _____ Flow of electrons along ETC causes  pumping of H+ into intermembrane space _____ builds up H + diffuses out through  ___________ –ADP and P join to form ATP Electrons at end of ETC join  H+ and O 2 to make  ________ –Oxygen acts as the “final electron acceptor”

Electron Transport Hydrogen Ion Movement ATP Production ATP synthase Channel Matrix Inner Membrane Intermembrane Space Electron Transport Chain

Energy and Exercise Cells normally contain small amounts of ATP produced by glycolysis and cellular respiration –Only enough for a few seconds of activity For activities that are “quick”  Once this is used up, muscles get their energy from lactic acid fermentation For activities that are “longer distance” –Stored energy in the muscles (a sugar called glycogen) will break down Lasts for about minutes Then the body will break down other energy containing molecules like fat

Review Questions 1. Where does the Krebs cycle take place? 2. What are the steps for the Krebs cycle starting with pyruvic acid? 3. What are the products of the Krebs cycle? 4. What is the electron transport chain and how is it used to produce ATP? 5. What acts as the final electron acceptor for the electron transport chain? 6. How does your body store energy for exercise?

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Cellular Respiration Animations Krebs Cycle: Part 1 Krebs Cycle: Part 2 Electron Transport Chain: Part 1 Electron Transport Chain: Part 2 Electron Transport Animation (1:59)Electron Transport Animation