Download Biology Chapter 4.4

Biology Chapter 4.4
KEY CONCEPT
The overall process of cellular respiration converts sugar into ATP using oxygen.
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Cellular respiration makes ATP by
breaking
down
sugars.oxygen.
Cellular respiration
is aerobic,
or requires
•
• Aerobic stages take place in mitochondria.
mitochondrion
animal cell
• Glycolysis must take place first.
–
–
–
–
anaerobic process (does not require oxygen)
takes place in cytoplasm
splits glucose into two three-carbon molecules
produces two ATP molecules
Cellular respiration is like a mirror image
of photosynthesis.
• The Krebs cycle transfers energy to an electron
transport chain.
Krebs Cycle
– takes place in
mitochondrial matrix
– breaks down three-carbon
molecules from glycolysis
– makes a small amount of ATP
– releases carbon dioxide
– transfers energy-carrying molecules
1
mitochondrion
ATP
matrix (area enclosed
by inner membrane)
and
6CO 2
energy
2
3
energy from
glycolysis
and
6O 2
inner membrane
ATP
and
6H 2O
4
•
The electron transport chain produces a large amount of ATP.
– takes place in inner membrane
– energy transferred to electron
transport chain
– oxygen enters process
– ATP produced
1
mitochondrion
ATP
matrix (area enclosed
by inner membrane)
and
6CO 2
energy
Electron Transport
3
energy from
glycolysis
6O 2
– water released as a
waste product
and
2
inner membrane
ATP
and
6H 2O
4
• The equation for the overall process is:
C6H12O6 + 6O2  6CO2 + 6H2O
•
The reactants in photosynthesis are the same as the products of cellular respiration.