Do Now: Complete Diagram

3 Steps to Aerobic Respiration Step 1 Glycolysis –Sugar is split into 2 pyruvate –2 ATP produced –2 NADH produced

We’ve Got Krebs! Aerobic Respiration Step 2

Krebs in Motion Krebs Cycle Highlights: –Requires oxygen –Oxidizes pyruvate to CO2 –1 glucose (2 pyruvate) produces: 2 ATP 8 electron carriers (mostly NADH)

What is NADH? NADH and other chemicals like it are electron carriers. They are very similar to rechargeable batteries

Electron Transport Chain The Electron Transport chain’s main function is to use the electrons from the Krebs cycle (NADH, etc.) to pump H+ ions and make a gradient in the mitochondria.

A Look At Electron Transport

Finishing Up Aerobic Respiration Final Step with a BIG BANG! The electron transport chain produces a WHOPPING 34 ATP molecules! That’s 1,500% more energy than glycolysis!!!

ATP Synthesis: Chemiosmosis The stored H+ will then power ATP synthase in the mitochondria just as it did during photosynthesis.

The Bottom Line: Aerobic = 30+ ATP per glucose Carbohydrates store energy Glycolysis splits glucose into 2 pyruvates, makes a little ATP. The Krebs Cycle finishes oxidizing pyruvate to CO2, makes a little ATP and A LOT OF NADH. The energy of NADH and other e- carriers are used by the e- transport chain to make a H+ gradient across the inner mitochondrial membrane. The H+ gradient is used by ATP synthase to produce ATP from ADP + Pi.

Respiration Reading Respiration is covered by chapter 6 in your textbook. You should read the chapter in its entierty over the course of this week, in preparation for a test next week.