click below
click below
Normal Size Small Size show me how
Human nutrition
Term | Definition |
---|---|
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 |