1. Digestive System!

2. Eating and Digestion: what it’s all about
Short animation here. Also a good resource!
Small
molecules
Pieces
of food
Chemical digestion
(enzymatic hydrolysis)
Nutrient
molecules
enter body
cells
Mechanical
digestion
Food
Undigested
material
INGESTION
DIGESTION
ABSORPTION
ELIMINATION

3. Your assignment: Produce a colorful, annotated diagram of the digestive system.
You may use any resources for research
Make sure each organ in your diagram is a different color
Label each structure and write a few sentences about its function.

4. Structure
Function
Mouth
Voluntary control of eating and swallowing. Mechanical digestion of food by chewing and mixing with saliva, which contains lubricants and enzymes that start starch digestion.
Esophagus
Movement of food by peristalsis from the mouth to the stomach
Stomach
Churning and mixing with secreted water and acid which kills foreign bacteria and other pathogens in food, plus initial stages of protein digestion
Small intestine
Final stages of digestion of lipids, carbohydrates, proteins and nucleic acids, neutralizing stomach acid, plus absorption of nutrients
Pancreas
Secretion of lipase, amylase and protease
Liver
Secretion of surfactants in bile to break up lipid droplets
Gall Bladder
Storage and regulated release of bile
Large intestine
Re-absorption of water, further digestion especially of carbohydrates by symbiotic bacteria, plus formation and storage of feces

5. human digestive system
LE 41-15b
Salivary
glands
A schematic diagram
of the
human digestive system
Mouth
Another way to think about it…
Esophagus
Gall-
bladder
Stomach
Small
intestines
Liver
Pancreas
Large
intestines
Rectum
Anus