Digestive system

INGESTIONINGESTION

FUNCTION/ PURPOSE

OF SYSTEM

DigestioDigestionnbreakdown of food

into molecular components small enough to cross the plasma membrane

Mechanical DigestionSame volume of food

Small total surface areaLarger total surface area

A larger surface area speeds up digestion

saliva

saliva

saliva

Digestion• Definition• Digestion is the breaking down of food into

smaller and simpler substances

• Mechanical digestion and Chemical digestion do this in different ways

ABSORBED ELIMINATED

STRUCTURE OF SYSTEM

The Digestive System Use the words below to label the parts of the digestive system. Liver large intestine appendix anus oesophagus rectum small intestine stomach mouth

The Digestive System Use the words below to label the parts of the digestive system. Liver large intestine appendix anus oesophagus rectum small intestine stomach mouth

TheDigestiveSystem

Mouth / Teeth

Esophagus

Liver

Stomach

Small intestine

Large intestine

Rectum

Anus

Appendix

BEHAVIOR AND

INTERCONNECTION

HW

REGION OF FOOD TUBE

STRUCTURES INVOLVED

BEHAVIOR

MOUTH TeethTongueSalivary Glands

Chewing (physical/mechanical digestion)Moves foodChemical digestion of starch

esophagus muscles peristalsis

STOMACHStomach lining

Mixing of food with gastric juice (HCl) producing chymeProtein digestionChurning of food (mechanical)

SMALL INTESTINE

DuodenumIleumLiver

Gall bladderPancreas

Final digestionAbsorptionProduces bile (digest fats/neutralize stomach acids)Stores bileReleases enzymes to help digestion

LARGE INTESTINE

Colon

Rectumanus

Removal of waste; reabsorb water and saltsStoring wasteexcretion

Digestion Flowchart

Assessment Criteria Points Self-Assessment

Teacher’s mark

A. Identified the main functions of the digestive system.

3

B. Listed the different structures of the 4 major areas of the digestive system

3

C. Described the behavior of each structure

3

D. Explained how the behavior of the different structures relate and contribute to the functions of the digestive system.

3

E. Properly organized ideas in a flowchart

3

F. Poster is artistically made and neatly presented

1

Total Points 16