How do the COMPONENTS of a

System INTERCONNECT?

http://www.whfoods.com/genpage.php?tname=faq&dbid=16#digestionAnimation of Digestion

INGESTION

FUNCTION/ PURPOSE OF SYSTEM

Digestionbreakdown 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

Smaller pieces allow for more areas of contact for enzymes and digestive juices to act on speeding up digestion

DigestionDefinition• Digestion is the breaking down of food into

smaller and simpler substances

• Mechanical digestion and Chemical digestion do this in different ways

ABSORBED ELIMINATED

Absorption

passage of molecules into body's interior &passage throughout the body

LARGE INTESTINES

ELIMINATION OF WASTE

REABSORBS WATER & SALTS

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

OBSERVING DIGESTIVE ORGANS1. External and internal structure of the stomach. a. How would you describe the external appearance of the stomach?

b. What is the action (behavior) of the stomach?

c. How is the stomach designed to perform its function?

2. External and internal structure of the small and large intestines

a. Describe the appearance of the small and large intestines.

b. What are the main actions (behavior) of the small and large intestines?

c. How is the small intestine designed to perform its function?

3. Determining the pH of gastric juice and bile a. Describe the role of gastric juice and bile in digestion.

b. How is the pH of gastric juice and bile related to its role in digestion?

BEHAVIOR

Image source:

http://www.flickr.com/photos/liujoanne/2172007698/

REGION OF FOOD TUBE

STRUCTURES INVOLVED

BEHAVIOR

MOUTH TeethTongueSalivary Glands

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

esophagus muscles peristalsis

STOMACH Stomach liningMixing 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

INTERCONNECTIONDigestion

Absorption Elimination of Waste