Bell Work!
• What is Cellular respiration?
CELLULAR
RESPIRATION
Ch 8.3
Using ATP to do work
• Can’t store
ATP it is
too
unstable
• Only used
in the cell
that made
it
ATP
Adenosine TriPhosphate
Adenosine DiPhosphate
ADP
work
Cellular Respiration
• Breaking down food
food
to produce ATP
• in the mitochondria
• uses oxygen
O2
ATP
Cell Respiration Check!
1. What reactants go into Cellular
Respiration?
2. What products come out of Cellular
Respiration?
3. 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
Glycolysis
Krebs
Cycle
Electron
Transport
Chain
ATP
2
NADH
2
FADH2
--
CO2
--
Quick Quiz!
• What is the starting molecule for
respiration?
Glucose
• What process splits glucose? Glucose
• What molecules are created in
glycolysis? NADH, FADH, Pyruvate
• Overall, how many ATP are produced
in glycolysis? 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
Glycolysis
Krebs
Cycle
Electron
Transport
Chain
ATP
2
2
NADH
2
8
FADH2
-2
CO2
-6
Quick Quiz!
• In which organelle does the Krebs
cycle take place? mitochondria
• What are the products of the Krebs
cycle? NADH, ATP, FADH2, & CO2
• How much ATP is produced in the
Krebs cycle?
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
Glycolysis
Krebs
Cycle
Electron
Transport
Chain
ATP
2
2
NADH
2
8
FADH2
-2
CO2
-6
34
--
--
--
Total of 38 ATP made for every glucose!
Quick Quiz!
• Which molecules move from the
Krebs cycle to the electron transport
chain?
NADH, FADH2
• What protein is powered by the H+
gradient?
ATP Synthase
• How many ATP are produced by
ETC?
~34 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
Quick Quiz!
• If there is no ____, pyruvate goes on
to __________ instead of the Krebs
cycle. Oxygen, fermentation
• In total, how many ATP are produced
in cellular respiration? ~ 38 ATP
• What are the three steps of cellular
respiration? Glycolysis, Krebs cycle,
electron transport chain