4.5 Cellular Respiration in Detail
Topic: Cellular Respiration (4.5)
Objective: Cellular respiration is an aerobic
process
4.5 Cellular Respiration in Detail
CELLULAR RESPIRATION EQUATION!
•
C6H12O6 + 6O2  6CO2 + 6H2O + ATP
• 3 STEPS TO RESPIRATION
– 1. GLYCOLYSIS
– 2. KREBS CYCLE
– 3. ELECTRON TRANSPORT CHAIN
4.5 Cellular Respiration in Detail
Glycolysis is needed for cellular respiration.
• The products of glycolysis enter cellular respiration ONLY
when oxygen is available.
– two ATP molecules are used to split glucose
– four ATP molecules are produced
– Net gain of 2 ATP
– two molecules of pyruvic acid produced
– Occurs in cytoplasm; does not require oxygen
4.5 Cellular Respiration in Detail
The Krebs cycle is the first main part of cellular
respiration.
– carbon dioxide (a
product) released
4.5 Cellular Respiration in Detail
• The Krebs cycle produces energy-carrying molecules.
– NADH, FADH2 and ATP
are made and
used in the electron
transport chain
4.5 Cellular Respiration in Detail
The electron transport chain is the second main part of
cellular respiration.
• The electron transport chain carries ATP, NADH and
FADH2 to make ATP.
– high-energy electrons enter electron transport chain
– hydrogen ions
flow through a
channel in the
membrane to make
ATP just like in
photosynthesis
4.5 Cellular Respiration in Detail
The electron transport chain is the second main part of
cellular respiration.
– Oxygen (a reactant)
picks up electrons and
adds to hydrogen ions
(H + O = water)
– water is produced (a
product)
• Breakdown one
glucose molecule =
38 ATP
4.5 Cellular Respiration in Detail
ATP and Glycolysis, Fermentation, and Oxidative Respiration
• Glycolysis – releases 2 ATP molecules for every glucose
molecule
• Fermentation – no ATP is made**
• Oxidative Respiration – 36 ATP are made for every
glucose molecule
4.5 Cellular Respiration in Detail
LAST TIME………
 C6H12O6 + 6 O2 6 CO2 + 6 H2O + 38ATP
 Do you “get it”?
– Glucose (from our food or what the plant made in
photosynthesis) in the presence of oxygen yields
carbon dioxide (from Krebs cycle) and water (the
electron transport chain) + ATP (energy)