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WHY WE RESPIRE??
Cellular respiration is a process by which organisms produce
ATP in a complex series of reactions.
ATP is the energy source for all metabolic reactions which
occur in the cell.
Energy is needed for many bodily Functions
·muscle contraction
·protein synthesis
·active transport
·maintaining body temperature
·nerve conduction…read more

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ATP (adenosine triphosphate) is the universal currency of
energy. It is a small molecule with 3 phosphate groups (P)
attached to an adenosine molecule i.e. Adenosine-P-P-P
During respiration, high energy C-C, C-H and C-OH bonds are
broken.
Lower energy bonds are formed and the difference is
released and
used to attach a P to Adenosine-P-P (ADP
adenosine diphosphate), making ATP.
When energy is required at a later time by a cell,
it can use the ATP and break a P off the end. This releases
the energy needed (30.6kJ for every ATP, ADP + P).
The more ATPs used, the more energy is released.…read more

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2 forms of respiration?:
AEROBIC RESPIRAITON: requires
oxygen and produce Co2, water and
A LOT OF ATP.
ANEROBIC RESPIRATION: takes
place in the absence of oxygen and
produces LACTATE IN ANIMALS and
ETHANOL AND Co2 IN PLANTS.
Both produces
LITTLE ATP.…read more

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4 STAGES TO RESPIRATION:
1. GLYCOLYSIS: splitting 6-C INTO 2 3-C molecules.
2. LINK REACTION: 3-C pyruvate into Co2 and 2-C acetlycoenzyme A.
3. KREBS CYCLE: introduce acetlycoenzyme A into a series of REDOX
reactions to produce little ATP and LARGE NUMBER OF
ELECTRONS.
4. ELECTRON TRANSPORT CHAIN: use electrons form Krebs cycle to
produce ATP and water as a bi-product.…read more

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