5th January 2014
GCSE Biology: The Respiratory System
Breathing in
1. Intercostal muscles contract 2. Ribs move out and up 3. The diaphragm contracts and moves down 4. The volume of the chest cavity increases 5. The pressure becomes lower in the chest cavity 6. Air is drawn into the lungs |
Breathing out
1. Intercostal muscles relax 2. Ribs move down and in 3. The diaphragm relaxes and bulges upwards 4. The volume of the chest cavity decreases 5. The pressure becomes higher in the chest cavity 6. Air flows out of the lungs |
Aerobic respiration
Glucose+Oxygen --------> Carbon dioxide+Water+Released energy
C₆H₁₂O₆+6O₂ -----> 6CO₂+6H₂O+ATP
Anaerobic respiration
Glucose -------> Lactic acid+Energy
C₆H₁₂O₆ --------> C₃H₆O₃+ATP
Glucose+Oxygen --------> Carbon dioxide+Water+Released energy
C₆H₁₂O₆+6O₂ -----> 6CO₂+6H₂O+ATP
Anaerobic respiration
Glucose -------> Lactic acid+Energy
C₆H₁₂O₆ --------> C₃H₆O₃+ATP
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