Question “Why do we breathe?”
Pre-School:
If you do not breathe, you die. You need to breathe to live.
Early Grade School:
We breathe because we need Oxygen to live.
Late Grade School:
We breathe to provide oxygen for our cells and get rid of carbon dioxide
Typical Freshman Biology :
We breathe so oxygen can burn our food to make energy
Advanced Freshman Biology:
We breathe so that oxygen can burn our food to make ATP in the
mitochondria
Glucose + Oxygen  Carbon Dioxide + Water + ATP
AP Biology:
We breathe because Oxygen is the final electron acceptor in the
ETC. The high-energy electrons are oxidized from glucose. The
electrons are used to pump Hydrogen ions to form a proton motive force
to make ATP by chemiosmosis
The Big Picture
C6H12O6 + O2  CO2 + H20 + Energy
Non-Living
ee-
No enzymes
Living
C6H12O6 + O2  CO2 + H20 + Energy
With enzymes
e-
ATP
Aerobic
Stage #2________
Anaerobic
Stage #1 ___________
Location in Cell___________
Cytosol
Mitochondria
Location in Cell __________
Glycolysis
Name of Process ____________
(Waste)
Acetyl -CoA
CoEnzyme A
_______
CO2
_____
Glucose
Kreb’s
___
(C6H12O6)
ATP
Cycle
________
___
H+ (e)
Pyruvic
Acid
_________
Pyruvic Acid
_________
ATP
If O2
Present
H+ (e)
____
____
ATP
O2
____
Lactic
Acid
________
If O2 Not
Present
ETC
____
(Requirement)
____
H2O