9WHAT IS IT ?Digestive System breaks down food into simpler substances for absorption into the blood stream.
10MOUTHDigestion begins at the mouth, where food is taken in and broken down into smaller particles by chewing. Saliva in the mouth moistens the food.
11The TeethThe teeth chew and tear the food into small bits of pieces.
12Salivary GlandsThey produce liquid like material called Saliva. Saliva has a digestive substance called enzymes.Enzymes: digest starches and converts them into simpler substances known as sugars
13It tastes food and mixes it with saliva. Tongue:It tastes food and mixes it with saliva.
14Common cavity leads to the esophagus and trachea. Pharynx:Common cavity leads to the esophagus and trachea.
15OESOPHAGUSThe esophagus is the tube that carries food, liquids and saliva from your mouth to the stomach.
16STOMACHStomach secretes gastric juice . Muscular sac works on mixing food.- Food changes into semi-liquid substance.- Incomplete digestion of protein by gastric juice The food then passes into the small intestine.
17SMALL INTESTINEFood is further digested in the small intestine with the help of enzymes from the pancreas and bile from the liver.
18Length about 7 meters. Coils inside the abdominal cavity It has two main parts: DuodenumIleumDuodenum: is the first part of the small intestine wherea- Bile juice is secreted from the liver.b- Pancreatic juice poured from the pancreasIleum: the digestion to different types of food iscompleted.
19Remember:Bile juice: helps to digest fats where it changes fats into fatty emulsionAbsorption: takes place through the small intestine walls
21LARGE INTESTINE Starts with the rectum and end in then anus. Rectum: water is absorbed from food remains.Anus: wastes are ejected out of the body.
22Keeping the digestive system healthy: Chew the food wellDon’t eat much food containing fats such as fatty food.Don’t eat food containing additives.Don’t purchase food from streets to avoid infectious diseases.Practice sports .