Cellular Respiration Ch. 4.4 – 4.5

Lesson Objectives At the end of this lesson, students will be able to… Describe the process of respiration Explain the role of glycolysis Explain the role of the Kreb’s Cycle and the electron transport chain

Cellular respiration **Remember: We called cellular respiration the “mirror image” of photosynthesis** Photosynthesis Respiration Goes in CO2, water, energy (from light) Sugar, O2 Comes out CO2, water, energy (as ATP)

Cellular respiration Glycolysis – Turns glucose into Cellular respiration Glycolysis – Turns glucose into pyruvate Krebs Cycle – Transfer energy from pyruvate bonds to NADH and FADH2 Electron Transport Chain – Use electrons from NADH and FADH2 to power ATP synthase

Cellular Respiration Main job/function Break down sugars to make ATP for the cell Requirements O2, Pyruvate (from glycolysis) What is produced ATP, CO2 and water as waste Location Membrane of mitochondria

Respiration: Glycolysis Glycolysis is a process that breaks glucose (6 carbons) into 2 molecules of pyruvate (3 carbons) – this also forms 2 ATP Pyruvate is needed as the first step to the Krebs cycle

Respiration: Krebs Cycle Also called the citric acid cycle Main job: rearrange C-molecules, transfer electrons to electron carriers – NAD and FAD Location: Matrix (open space) of mitochondria Input: Pyruvate from glycolysis Output: CO2, ATP, NADH, FADH2

Respiration: Electron Transport Chain and ATP Synthase Location: Across inner membrane of the mitochondria Main job: Build up H ion gradient for ATP synthase Input: NADH and FADH2 from Krebs, Output: Up to 38 ATP!!