Transcript Alternative Pathways in cell respiration

Alternative Pathways in
cell respiration
Cell Respiration is separated into 3 stages
KREBS CYCLE
GLYCOLYSIS
NADH
Pyruvate
NADH
Glucose
ATP
NADH
FADH2
Krebs
Cycle
CO2
ELECTRON TRANSPORT
AND OXIDATIVE
PHOSPHORYLATION
ATP
CO2
Electron transport
chain...
H 2O
ATP
Energy/electrons are transferred from glucose to
convert NAD+ to NADH, which is used in the
ETC to make ATP
I eat more than just glucose, what
happens to all that stuff?
Vs.
The metabolism of all macromolecules is
tied to cellular respiration
• Carbohydrates, fats, and proteins can be broken
down and used in glycolysis and the Kreb’s cycle.
Fats
Fatty acids
Krebs
cycle
Glycerol
Carbs
Sugars
Proteins
Amino
acids
Glucose
NH3
Pyruvate
Acetyl
CoA
Cellular respiration is
carefully regulated:
when ATP is abundant,
respiration slows down
when ATP is needed,
respiration speeds up
The metabolism of all macromolecules is
tied to cellular respiration
• Excess intermediates of glycolysis and the Kreb’s
cycle can be converted to stored carbohydrates, fats
and proteins.
Pathway for
synthesis of
RNA, DNA
Fats
Glycogen
or starch
Glucose
Phospholipids
Fatty acids
Pruvate
Acetyl
CoA
Lactate
(from fermentation)
Krebs
cycle
Several
intermediaries
used as
substrates in
amino acid
synthesis
I eat only fat-free foodsWhy am I still getting fat?