Overview of respiration

Biology Unit 5

Overview of respiration

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Biology Unit 5
Revision Notes
Topic 7: Run for your life
5. Describe the overall reaction of aerobic respiration
as splitting of the respiratory substrate (eg glucose)
to release carbon dioxide as a waste product and
reuniting of hydrogen with atmospheric oxygen with
the release of a large amount of energy.
The overall reaction:
CHO + 6O 6HO + 6CO
Cellular respiration is the process by which organisms produce ATP. The food (known as the
respiratory substrate, generally glucose) is usually oxidised as completely as possible. Oxygen from
the air is used in the process, and carbon dioxide and water are formed as waste products.
Many oxidation and reduction (redox) reactions occur. Eg. Hydrogen is broken from glucose and
passed along an electron transfer chain to produce ATP and Carbon is oxidised (electrons removed ­
OIL RIG) to produce CO.
There are lots of enzymes involved whose rates of reaction are controlled by inhibitors, i.e. if lots of
energy is required, the inhibitors become less active, speeding up the enzyme reaction and
consequently respiration.
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Text Book: p.128-129


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