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Chapter 28
Human Nutrition
Question | Answer |
---|---|
Autotroph | Make their own food e.g Plants through Photosynthesis |
Heterotroph | Take in food from a live source e.g Parasites, Fleas |
Ingestion | The taking in of food into the digestive system |
Digestion | The physical and chemical breakdown of food |
Absorption | Occurs when digested food passes through the digestive system and enters the blood |
Egestion | The removal of unabsorbed waste from the digestive system |
Dental Formula | 2( I 2/2, C 1/1, P 2/2, M 3/3) |
Oesophagus | Carries food to stomach through peristalsis |
Stomach | Muscular bag that holds and digest food Coated by mucus Lining is folded forming millions of gastric glands Contains HCl (pH 1-2) to kill of bacteria |
Pancreas | Makes insulin to regulate the glucose level in the blood The pancreatic juices release sodium bicarbonate which neutralises chyme |
Liver | Detoxifies body from poisons such as alcohol or drugs Breaks down old/damaged red blood cells |
Small Intestine | Duodenum-Final part of digestion Ileum-Absorption |
Enzymes | Amylase-Starch-Maltose Lipase-Fats-1 Glycerol and 2 Fatty Acids Pepsin-Potein-Amino Acids |
Large Intestine | Caecum and Appendix - Vestigal Organs Absorbs water Colon produces symbiotic bacteria such as Vitamin B and K Rectum and Anus - Faeces waits to be ejested |
2 functions for symbiotic bacteria | 1) Obtains food from humans and in return produces useful vitamins such as Vitamin B and K 2)Prevents growth of disease-causing fungi |
Why do humans need a balanced diet? | It is needed to ensure that the body gets all the necessary energy and nutrients |
Benefits of dietary fibre | It's made up of cellulose from plant cell walls Absorbs and stores water Stimulates peristalsis |