Presentation on theme: "HUMAN DIGESTIVE SYSTEM. TARGET AUDIENCE AGE - 11 – 14 yrs. CLASSES - VI - VIII."— Presentation transcript:
HUMAN DIGESTIVE SYSTEM
TARGET AUDIENCE AGE - 11 – 14 yrs. CLASSES - VI - VIII
LEARNING OBJECTIVES After interacting with this software, learner will be able to- 1) Define Digestive System. 2) Identify its different organs. 3) State the functions of each organ.
WHAT IS IT ? Digestive System breaks down food into simpler substances for absorption into the blood stream.
MOUTH Digestion begins at the mouth, where food is taken in and broken down into smaller particles by chewing. Saliva in the mouth moistens the food.
STOMACH Stomach secretes gastric juice which kills micro- organisms that may have been ingested with food. The food then passes into the small intestine.
OESOPHAGUS Muscles in the throat make it possible to swallow food, which then descends through a muscular tube, called oesophagus, to enter the stomach.
SMALL INTESTINE Food is further digested in the small intestine with the help of enzymes from the pancreas and bile from the liver.
LIVER All blood leaving the small intestine travels to the liver. The liver removes absorbed nutrients from the blood and either stores them or converts them into products needed by the body.
LARGE INTESTINE The walls of the large intestine absorb water from the undigested food, leaving semi-solid waste matter called faeces. These waste products are excreted from the body through the rectum and anus.