| Reactants i.e. needed by the process | Products i.e. made by the process | Not "made" but released from molecules of reactant | |||
| Glucose | + oxygen |  |
carbon dioxide | + water | + energy |
 From digestion of food especially carbohydrates |
From air breathed in |
Into air breathed out |
Left in cell/blood/ breathed out as vapour |
More efficient than anaerobic respiration Energy is trapped in the molecular structure of ATP |
|
| Delivered to cells in bloodstream | Removed from cells in blood stream | Used to power all the cell's processes- movement, electrical activity, synthesis |
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| Process | Description | Powered by | Route | More detail |
| Breathing ** advanced organisms only |
Forced movement of air | Movement of chest & diaphragm 18 per min? |
From air outside body into alveoli in lungs (In and out) |
(Air containing) oxygen in (Air containing) carbon dioxide out |
| Circulation ** advanced organisms only |
Forced movement of blood | Contraction of heart 72 per min? |
Lungs to heart to body to heart, and back to lungs etc (round and round) |
Dissolved oxygen into red blood cells, dissolved carbon dioxide in plasma |
| Diffusion | Oxygen from red blood cells into plasma, through tissue fluid into cells Carbon dioxide from cells into tissue fluid and plasma |
[passive process – random molecular movement] Into all cells of the body |
From high to low concentration i.e down concentration gradient |
Very short distances involved |