1. Cellular Respiration
Ch. 4.4 – 4.5

2. 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

3. 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)

4. 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

5. 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

6. 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

7. 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

9. 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!!