Food and digestion
Digestion: the process of breaking down food stuffs
Ingestion:The process of taking a material into the mouth or the body
Absorption: The physical process of taking small food molecules into an organisms cells
Egestion:The process of expulsion of undigested food material from the digestive tract via the anus as faeces
Enzyme: a chemiacal which helps dissolve food, found in spit, so it can make food soluable.
Micro-organisms- they need sugars, proteins, lipids, water and vitamins and minerals to grow
Bacteria and virus
- Makes yeast (bread)
- Causes illness,infection and disease
White blood cells: destroy killer cells
- B-cells release antibodies which neutralise viruses and bacteria
- Some eat bacteria and digest them
- memory cells remember previous diseases and prevent re-infection.
- yellow disease