Nurul Athirah ArbiNurul Athirah Arbi

111 4040 168111 4040 168

ICP A 2011ICP A 2011

Biology DepartmentBiology Department

Human Digestive SystemHuman Digestive SystemHuman Digestive SystemHuman Digestive System

English Subject Matter : Microteaching

Digestive System

Digestion is the complex process of turning the food you eat into nutrients, which the body uses for energy, growth and cell repair needed to survive. The digestion process also involves creating waste to be eliminated.

Digestive System

The digestive system is a group of organs

working together to convert food into energy

and basic nutrients to feed the entire body.

Components

• Mouth• Esophagus• Stomach• Small Intestine• Large Intestine• Anus

MouthFood is partly broken down by the process of chewing and by the chemical action of salivary enzymes (these enzymes are produced by the salivary glands and break down starches into smaller molecules).

Esophagus

• the tube that connects your mouth and your stomach

Stomach• A stretchy bag that

holds your food after you eat

• Helps to break food into smaller pieces so your body can use it for energy and nutrition

Small Intestine

• Tube that is 20 feet long.

• Continues to digest food

• Food stays in your small intestine for 4 to 8 hours

Large Intestine

• Tube that is 5 feet long

• Gets waste from small intestine

• Waste stays for 10 to 12 hours

Anus

• Solid waste is then

stored in the rectum

until it is excreted via

the anus.

Actions of Digestive (GI) Tract

• Ingestion– Occurs when material

enters via the mouth

• Mechanical Processing– Crushing / Shearing –

makes material easier to move through the tract

• Digestion– Chemical breakdown

of food into small organic compounds for absorption

• Absorption– Movement of organic

substrates, electrolytes, vitamins & water across digestive epithelium