Getting energy from food

• Inhale:

  1. the intercostal muscles contract, expanding the ribcage
  2. diaphragm contracts, pulling downwards to increase the volume of the chest
  3. pressure inside the chest is lowered and air is sucked into the lungs
• exhale

  1. the intercostal muscle relaxes, the ribcage drops inwards & downwards
  2. the diaphragm relaxes, moving back upwards, decreasing the volume of the chest
  3. pressure inside the chest increases & air id forced out
• Respiration: the release of energy from glucose in the muscles
• Aerobic respiration: Glucose + Oxygen = energy + water + CO2
• Anaerobic respiration: Glucose = energy + lactic acid
• Gaseous exchange involves the passage of carbon dioxide & oxygen through a respiratory surface
• Respiration: A chemical process in cells that generates energy and releases Co2
• The equation for cellular respiration is C6H12O6 + 6O2 → 6CO2 + 6H20 + Energy