Transcript CELLULAR RESPIRATION

Chapter 9
Cellular Respiration
 The
process that releases
energy (ATP) by breaking down
food molecules in the presence
of oxygen
Mitochondria
 Found?
 Plant & Animal Cells
 Where
respiration
takes place
 Just aerobic parts
Aerobic Vs. Anaerobic
Respiration
 Aerobic = presence
 Respiration
 Anaerobic
of O2
= absence of O2
 Fermentation
Pathway of Cellular Respiration
 Glycolysis
(Cytoplasm)
 Krebs Cycle (Mito.)
 Electron Transport Chain (Mito.)
Glycolysis
 “Glukus”
= sweet
 “Lysis” = loosening
 Occurs in Cytoplasm
 Breaking one glucose down into 2
pyruvic acids(3 Carbon) & 2 ATP
(net)
After Glycolysis
 Anaerobic
= Fermentation
 Aerobic = Cellular Respiration
Fermentation
 Fermentation
without O2
 Two types
 Alcoholic
 Lactic acid
will make energy
Alcoholic
 Yeast
& other microorganisms
 CO2 causes bread to rise
Lactic Acid
 Animal
muscles
 Happens during vigorous exercise
 Builds up in muscles causing
cramps
Krebs Cycle
 Follows
glycolysis
 Needs oxygen
 Respiration
 Occurs
in mitochondria
 Breaks down products of glycolysis
into carbon dioxide
 Releasing energy to make electron
carriers and ATP
Krebs Cycle
Electron Transport Chain
 Inner
membrane of mitochondria
 Electrons move to produce
energy
ETC:
– 2-3 per electron carrier
 Oxygen is used as the final electron
acceptor (H+)
 Forms water
 Makes ATP
Mitochondrial
membrane
NADH
NADH enters and releases
an H+ and an electron.
Mitochondrial
membrane
e-
NAD+
NADH enters and releases
an H+ and an electron.
Mitochondrial
membrane
eO
H+
H+
H+
H+
H+
H+
H+
H+
The electron travels to the next protein
while simultaneously sending H+
across the membrane
Mitochondrial
membrane
H+
H+
H+
H2O
H+
H+
H+
ADP
P
The electron is used to form water. The H+
then are pumped back into the mitochondria.
Mitochondrial
membrane
H+
H+
ATP
H+
H+
H+
H+
This allows ATP to be made
each time a H+ enters back in.
Totals
 Glycolysis
 Net 2 ATP
 Krebs
 2 ATP
 ETC
 32 ATP
**Total = 36 ATP
Photosynthesis Vs
Cellular Respiration