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Transcript of DIGESTIVE SYSTEM
The process of breaking down and absorbing food is called
The systems that deals with it is called
Digestion starts even before the food reaches your mouth. The smell of food triggers your salivary glands to produce saliva.
breaking down food into small pieces.
e.g. grinding in the mouth, peristalic contractions in the stomach
breaking down food into small pieces that can be used by cells.
Made from several muscles.
Mixes broken food with saliva and the food is made into a ball called
, an enzyme which breaks down starch into sugar.
Muscular tube that connects the mouth to the esophagus.
Allows food to pass through.
Used in both digestive and respiratory system.
Flap of tissue that separates food and air.
Prevent food going down the trachea.
Prevents food from leaving the stomach.
Transports food and water from the mouth to the stomach.
Made from muscular tube and the muscle pushes the food down to the stomach.
Produces peristalsis waves.
Stores, produces and concentrates bile.
It is hidden just behind the liver.
First few centimetres of small intestine.
Receives secretion from pancreas/liver to help digest food.
Small tube same size as your little finger.
Acts as a 'safe house' for good bacteria.
Temporary storehouse for faeces.
Food passes, a little at a time.
Completes the digestion of
and turns into small molecules of
Small molecules go through thin walls of
in the small intestine.
Liver is the biggest organ in your body.
Helps to clean blood.
types of digestion.
Why we need it
What it is found in
Vitamins & Minerals
Quick release of energy
Store energy, lnsulation, protect organs and to make cell membranes
Growth and repair
Prevent constipation and bowel cancer
Rice, potatoes, bread, pasta
Chocolate, fizzy drinks, sweets, fruit juice
Oil, butter, cheese, cream
Meat, eggs, fish, nuts, soya beans
Corn, beans, avocado, oatmeal
Made of protein can be used many times.
Are responsible for specific chemical reactions.
Work at optimum pH and temperature.
Works the best in 37 degrees celsius and pH 2 and 7.
Types of Enzymes
Food acted on
Food broken down into
Carbohydrase (eg. Amylase)
mouth, small intestine
Protease (eg. Pepsin)
stomach, small intestine
fatty acids, glycerol
By Hanaka Ikeda & Haru Ooka & Karin Arata
Glands produce hydrochloric acid (HCl) and pepsin.
Digests food and kills bacteria
Faeces are removed from the anus.
Increases the surface area of the walls of the small intestine so that food can be digested faster.
Water and some disolved vitamins are absorbed.
Remaining substances form faeces.
Common Illness/Disorder In Digestive System
Irritable bowel syndrome
Heart burn is when concentrated acid in the stomach comes up the eosophagus and your mouth. It is discribed as your heart is burning because your eosophagus is behind your heart.
Jaundice (yellow skin)
Occurs when your liver doesnt break down bilirubin. Bilirubin is a waste product of the normal breakdown of red blood cells.