Transcript Document

32.2 Digestive System
Word Bank
Anus
Esophagus
Gallbladder
Large Intestine
Liver
Mouth
Pancreas
Salivary Glands
Rectum
Small Intestines
Stomach
Sponge #8
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
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 begins in the mouth and continues in the
stomach.
• Mechanical (teeth) and chemical (saliva) digestion break
down food.
• Peristalsis moves food through the organs.
esophagus
muscles
contract
muscles
relax
food
stomach
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
• Most digestion takes place in the small intestines.
• The pancreas, liver, and gallbladder aid in digestion.
– pancreas helps digest fat and protein
– bile from the liver/gallbladder helps digest fats
liver
bile
stomach
chyme
bile
enzymes
gallbladder
pancreas
duodenum
32.2 Digestive System
Sponge # 9
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