32.2 Digestive System
Word Bank
Anus
Esophagus
Gallbladder
Large Intestine
Liver
Mouth
Pancreas
Salivary Glands
Rectum
Small Intestines
Stomach
Sponge
1
11
2
10
3
9
4
8
7
5
6
32.2 Digestive System
mouth
Salivary glands
esophagus
liver
stomach
gallbladder
pancreas
Large intestines
anus
Small intestines
rectum
Set
Cornell Notes
on pg.
29.4upCentral
and Peripheral
Nervous Systems
79
32.2
Digestive System
2.1 Atoms,
Ions,
and Molecules
•Topic: 32.2 Digestive
System
•Essential Question(s):
1. No EQ   
32.2 Digestive System
KEY CONCEPT
The digestive system breaks down food into simpler
molecules.
32.2 Digestive System
•In 1822, Alexis St. Martin was shot in the stomach and treated
by William Beaumont, an army surgeon
•The bullet had left a small hole in his stomach
•Beaumont persuaded St. Martin to let him observe the
digestive process by tying foods to string, putting them into the
stomach, and observing how the food was digested
32.2 Digestive System
The digestive system is a collection of organs that breaks
down food into energy that can be used in cells
mouth
esophagus
liver
gallbladder
large
intestine
small intestine
rectum/anus
32.2 Digestive System
32.2 Digestive System
• After digestion is complete,
nutrients are absorbed and
transported to all cells.
mouth
esophagus
liver
• Undigested materials are
eliminated as liquid and solid
wastes (urine/feces)
gallbladder
large
intestine
small intestine
rectum/anus
32.2 Digestive System
• Digestion of carbohydrates begins in the mouth.
• Digestion of proteins occurs in the stomach.
• Digestion of fats and sugars occur in the
small intestine.
32.2 Digestive System
Mouth
• Teeth: Mechanical digestion, shred and grind food
• Saliva: chemical digestion
• Enzyme: amylase (Am-uh-Lays)
• Breaks down starch into sugars
• Tongue: Keeps food positioned between teeth
• Digestion starts in the mouth!!!!
stomach
32.2 Digestive System
Esophagus
• Tube that connects mouth to the stomach
• Peristalsis (pear-ih-stawl-sis) moves food
through the organs
esophagus
muscles
contract
muscles
relax
stomach
food
32.2 Digestive System
Stomach
• Muscular sac
• Holds up to 2 quarts of food
• Continues digestion
– Proteins are digested in the stomach
• Chyme: semi-liquid mixture of food
• 2-6 hours to digest food
32.2 Digestive System
Pancreas, Liver, and Gall bladder
• Aid in digestion
– Pancreas: helps digest fat, protein, and starches
– Liver: Produces bile which helps digest fats
– Gallbladder: stores bile
liver
bile
stomach
chyme
bile
enzymes
gallbladder
pancreas
duodenum
32.2 Digestive System
Small Intestines
• Most digestion takes place in the small intestines
• Digests:
– Proteins
– Fats
– Sugars
32.3 Absorption of Nutrients
Large Intestine, Rectum, Anus
• Large Intestine: helps to maintain the body’s fluid balance
• Absorbs water and salt
• Undigested material forms the solid feces.
– stored in rectum
– eliminated through anus
32.2 Digestive System
Sponge
1. What is the main function of the digestive
system?
2. Describe how the mouth uses both
mechanical and chemical digestion.
3. What three organs aide the small intestine
with digestion?
4. If you ate a meal of spaghetti and meatballs,
where would digestion of the pasta begin? The
meat?
32.2 Digestive System
• What is the main function of the digestive system?
• To break down food into smaller molecules for the body
to absorb and use for
energy.
• Describe how the mouth uses both mechanical and
chemical digestion.
• Mechanical: teeth chew food
• Chemical: enzymes in saliva break down starches
• What three organs aide the small intestine with
digestion?
• Gallbladder, liver, and pancreas
• If you ate a meal of spaghetti and meatballs, where
would digestion of the pasta begin? The meat?
• Spaghetti: in mouth- starches
• Meatballs: in stomach- proteins
32.2 Digestive System
Circulatory and Digestive System Posters
• Title on top
• Describe the
FUNCTION (job) of
your organ
• Draw a picture
• Answer all questions
on prompt
• Color
• Use Big font