Bell Work! What is Cellular respiration?

Cellular Respiration Ch 8.3

Adenosine DiPhosphate Adenosine TriPhosphate Using ATP to do work Can’t store ATP it is too unstable Only used in the cell that made it ATP work Adenosine DiPhosphate Adenosine TriPhosphate ADP

Cellular Respiration Breaking down food to produce ATP in the mitochondria uses oxygen

Cell Respiration Check! What reactants go into Cellular Respiration? What products come out of Cellular Respiration? How does the formula for Cellular respiration relate to the formula for photosynthesis?

Cellular Respiration: Overview

Glycolysis Breaks 1 Glucose into 2 Pyruvate Occurs in the Cytoplasm. Makes 2 ATP molecules Makes 2 NADH

Copy This Table to your notes! Process ATP NADH FADH2 CO2 Glycolysis 2 -- Krebs Cycle Electron Transport Chain

Quick Quiz! What is the starting molecule for respiration? What process splits glucose? What molecules are created in glycolysis? Overall, how many ATP are produced in glycolysis? Glucose Glucose NADH, FADH, Pyruvate 2

Mitochondria Structure Smooth outer membrane Cristae -Highly folded inner membrane Intermembrane space – fluid filled between membranes Matrix inner fluid filled space

Krebs cycle Aerobic -If oxygen is present the pyruvate will continue to the Krebs cycle. Occurs in the mitochondria 2 cycles of Krebs cycle per glucose

Krebs Cycle Per glucose the Krebs cycle makes: 6 CO2 molecules, 2 ATP, 8 NADH, 2 FADH2.

Copy This Table to your notes! Process ATP NADH FADH2 CO2 Glycolysis 2 -- Krebs Cycle 8 6 Electron Transport Chain

Quick Quiz! In which organelle does the Krebs cycle take place? What are the products of the Krebs cycle? How much ATP is produced in the Krebs cycle? mitochondria NADH, ATP, FADH2, & CO2 1 (x2 because 2 pyruvate)

Electron Transport Chain Final step in Cell respiration 32 ATP made from NADH and FADH2

Electron Transport Chain Electrons move down the chain protons move Across the membrane Building proton gradient!

Chemiosmosis A proton gradient is set up Proton move through ATP synthase Makes ATP

Copy This Table to your notes! Process ATP NADH FADH2 CO2 Glycolysis 2 -- Krebs Cycle 8 6 Electron Transport Chain 34 Total of 38 ATP made for every glucose!

Quick Quiz! Which molecules move from the Krebs cycle to the electron transport chain? What protein is powered by the H+ gradient? How many ATP are produced by ETC? NADH, FADH2 ATP Synthase ~34 ATP

Overview Cellular Respiration ~38 ATP Overview Cellular Respiration + + 2 ATP 2 ATP ~34 ATP

What if oxygen is missing? No oxygen = Anaerobic respiration Fermentation: 2 types Alcohol fermentation Lactic Acid fermentation Doesn’t make much ATP

Fermentation Alcohol fermentation Yeast Glucose  ATP + CO2 + alcohol Lactic Acid Fermentation Bacteria, Animals Glucose  ATP + Lactic Acid

Glycolysis, Krebs cycle, electron transport chain Quick Quiz! If there is no ____, pyruvate goes on to __________ instead of the Krebs cycle. In total, how many ATP are produced in cellular respiration? What are the three steps of cellular respiration? Oxygen, fermentation ~ 38 ATP Glycolysis, Krebs cycle, electron transport chain