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Human nutrition

Autotrophic An organism makes its own food
Heterotrophic An organism must get its food from the environment
Herbivores Eats plants
Carnivores Eat other animals
Omnivore Eat plants and animals
Mechanical digestion Physical break down of food
Chemical digestion Breaking down food by enzymes and stomach acid (PH2)
Digestive system Alimentary canal =gut=long tube from mouth to anus
Ingestion Taking food into the body
Digestion Breaking down food
Absorption Movement of digested food from the gut into the bloodstream by diffusion
Egestion Removal of unabsorbed food from the body
Incisors For biting
Canines For tearing
Premolars For chewing
Molars For chewing
Lysozyme An enzyme that kills micro organisms
Peristalsis Muscular interactions of the gut
Fibre roll To prevent constipation
Fibre source Fruit and vegetables
Fibre Benefit Reduces risk of colon cancer
Stomach function Stores and digests food
Stomach structure Lining of the stomach is heavenly folded into millions of gastric glands
Goblet cells Secrete mucous (lines stomach,prevents it from digesting it's self)
Zyomogen cells Secrete pepsinoegn (inactive form of pepsin )
Oxyntic cells Secrete HCL kills bacteria and activates pepsin
Mucous + pepsinogen+ HCL Gastric juice
3 parts of the small intestine Duodenum ,ileum , jejenum
Duodenum function Digestion
Duodenum Has many villi and micro villi
Pancreas function Secretes insulin,produces sodium bicarbonate,produces amylase
Liver function Makes bike,breaks excess protein down into urea,stores irons and vitamins
Gall bladder function Stores bile
Bile duct function Transports bile from the gall bladder to the duodenum
Illeum/jejunum function Absorption
Ileum /jejunum adaptions Many villi,villus walls only one cell thick ,rich boo I'd supply inside the villus
Hepatic portal vein function Transports nutrients from ileum/jejunum to liver
Hepatic vein function Transports wastes like urea to the the kidneys
Lacteals functions Contains lymph
Created by: Jessicakirwan