Chapter 4 Cellular Respiration GCA Mr. Cobb
Jan 03, 2016
Cellular respirationFood (glucose) into ATP
Not “breathing”
It can be either aerobic or anaerobic
Aerobic – require oxygen
Anaerobic – does not require oxygen
3 Stages of 3 Stages of Aerobic Cellular RespirationAerobic Cellular Respiration
Glycolysis
Preparation Step &
Citric Acid Cycle (Kreb’s Cycle)
Electron Transport
Glycolysis1st step in aerobic or anaerobic
Location: cytoplasm of cell
Glucose 2 Pyruvic Acid molecules
This process does not require Oxygen.
Total energy made is 4 ATP, but 2 is needed to start the rxn. 2 ATP is extra.
What is made? 2 NADPH, 2 ATP, 2 Pyruvic Acids
AerobicO2 required
Release H2O and CO2 and energy
Remember that cellular respiration is the opposite of photosynthesis.
C6H1206 + 6 O2 6 CO2 + 6 H2O + ATP
Aerobic RespirationGlycolysis is 1st step and in both aerobic or
anaerobic respiration
2 Steps in Aerobic Respiration:
2. Citric Acid Cycle or Krebs Cycle
3. Hydrogen and Electron Transport System
Cellular Respiration Flowchart (aerobic)
Glucose(C6H1206)
+Oxygen
(02)
Glycolysis KrebsCycle
ElectronTransport
Chain
Carbon Dioxide
(CO2)+
Water(H2O)
+ATP
Citric Acid Cycle (Krebs)2 Pyruvic acids from glycolysis diffuses into the
mitochondria.
Pyruvic acid is turned into acetyl CoA and CO2 is released.
One glucose molecule makes the cycle turn twice
Chemical rxns in Mitochondria
Products: 6 NADH, 2 FADH2, 2 ATP and 4 CO2
Electron Transport NADH and FADH2 from Krebs Cycle are pumped
by electron energy across the inner membrane (cristae) and creates a concentration difference.
The H ions come back across through the ATP synthase and create ATP.
Oxygen (from what we breathe in) comes in and binds to the H ions to make water.
matrix
HH++
HH++
HH++
HH++
HH++
HH++
MitochondriaMitochondria
HH++
HH++
NADH
HH++
FADH2
e-
HH++
HH++ e-
HH++
Electrons
* passed across inner membrane
* their energy gradually decreases
* energy used to transport HH++
into the intermembrane space.
OxygenOxygen * the final electron acceptor * joins with HH++ to produce HH22O.O.
If there is no oxygen,the electron chain stops
because there is no way to release electrons . .
electrons
matrix
HH++
HH++
HH++
HH++
HH++
HH++
MitochondriaMitochondria
HH++
HH++
NADH
HH++
FADH2
e-
HH++
HH++ e-
HH++
What happens when there is no oxygen
to accept the electrons?
* glycolysis done
* then fermentation in cytoplasm
2 kinds
1)lactic acid
2)ethanol
Alcoholic FermentationAlcoholic Fermentation
After glucose broken down to pyruvate,
then pyruvate broken down
to CO2 and ETHANOL.