C6H12O6 + 6 O2 → 6 CO2+ 6 H2O + 2808 kJ

• Respiration- exothermic or endothermic?

• In th body- the energy is released in several steps usin adenosine triphopshate, ATP

• Which reaction type?• Draw half reactions. What is

oxidized/reduced?

Adenosine triphosphate ATP

Glucose is transported by the blood to all cells in the body

• Glucose is degraded in the cytoplasm to pyruvic acid, pyruvate (glycolysis)

Glucose + O2 pyruvate + 2 H2O

• The pyruvate is degraded to CO2 in the mitocondriae (krebs cycle)

2 pyruvate + 5 O2 6 CO2 + 6H2O

Aerobic or anaerobic?

Krebs cycle (not required)

Cytochromes- enzymes in the respiration chain

Redox reactions with cytochromes

C6H12O6 + 6 H2O 6 CO2 + 24 H+ + 24 e-

O2 + 4 H+ + 4 e- 2 H2O

Fe3+ + e- Fe2+

Cu2+ + e- Cu+

ox

red

Haem group in haemoglobin

Poisoned by CO and CN-

Haem and cytochrome c oxidase are prostetic groups in the respiratory enzymehttp://www.helsinki.fi/lehdet/uh/liite01n.htm