What is carbohydrates, proteins and fats? one sugar molecule Carbohydrate molecule protein molecule one amino acid fat molecule fatty acids glycerol
But how does a 9m tube fit into a space, which is less than a metre long? The digestive system is really one long tube with an opening at each end. Stretched out it is a 9m tube! mouth anus
Okidoki!! Let’s go for a ridethrough your body!
Digestion begins in the mouth where food is broken down by the teeth. This is called mechanical breakdown. The small parts of food are mixed with saliva and swallowed.
food enters from the gullet muscle tissue food leaves the stomach After food is swallowed it enters the stomach, which is basically a muscular bag filled with hydrochloric acid. Two things happen to food in the stomach:
The stomach Digestive enzymes are the chemicals that break large food molecules into smaller molecules. Otherwise the molecules are to big for our body to take up!
Duodenum - tolvfingertarm Here the digestedfood is mixed with bile from the gallbladder and juices from the pancreas. The bile: Breaks up larger fat drops to smallerdroplets The juices from the pancreas: Neutralize the acid from the stomach Mix the digestedfood with enzymes
Enzymes sugar molecules Pepsin long carbohydrate molecule + glycerol long proteinmolecule amino acid molecules Lipas fatty acids Amylas
The small intestine It is in the small instestine the small molecules gets through the thinwalls and reaches the bloodvessels. The walls are folded in so calledvilli (tarmludd).
The largeintestine Here in the largeintestine water is sucked back into the body. If this doesn’t work… then you get diarrhea. Colibacterialives in the largeintestine and helpmaking K-vitamins. Theyhelp with the last of the digestion and thenalso make methane gas…. …a fart in otherwords!
The anus The ex-foodleaves the body through the anus. When the pooreaches the anus signals are sent to the brain to relax the musclesand the poo is pressed out.