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Introduction to the Digestive System

Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

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Page 1: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

Introduction to the Digestive System

Page 2: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

Digestive System

Large complex molecules broken down into simpler molecules

Long tube beginning with mouth and ending with the anus

Page 3: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

Digestive Systems

Man and pig have a simple stomach with an extensive intestinal system

Ruminants have a complex stomach with a simpler intestinal system

Horses and rabbits have a simple stomach with an extensive intestinal system and an enlarged cecum

Page 4: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

Digestive System Mouth: “Prehension” tool (grasps food)

– Salivary glands secrete juices containing enzymes (digest food)

– Chewing food breaks down Esophagus: muscular tube that connects

mouth to stomach– Peristaltic Movement: sequential contraction

of ringlike muscles– Reverse Peristalsis = vomiting

Page 5: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

Simple Stomach

Muscular contractions break down food Enzymes break down food:

– Gastric: proteins– Liver and pancreatic: fats

Page 6: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

3 Major Digestive Systems

All 3 systems will be addressed in detail in the lesson to follow:

Ruminants—have four stomaches Monogastric—have one stomach Modified Monogastric—have one stomach

but the ability to digest roughages

Page 7: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and
Page 8: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and
Page 9: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

Digestive System Small Intestine: long coiled tube

connecting stomach to large intestine– rest of the digestion and absorption takes

place here– surface covered with villi (surface area)

Large Intestine: Cecum, colon, rectum– absorbs water (makes feces more solid)– some vitamins and minerals absorbed here– Cecal Fermenters (Horse): similar to rumen

Page 10: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

Digestive System

Accessory organs: Pancreas secretes enzymes to break

down fat Liver (largest internal organ) secretes

bile, which digests fats– also stores iron

Page 11: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

Introduction to the Digestive System

Page 12: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

Digestive System

Large _________________broken down into simpler molecules

Long tube beginning with ______and ending with the______________

Page 13: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

Digestive Systems

Man and pig have a ________stomach with an extensive intestinal system

Ruminants have a ___________ stomach with a simpler intestinal system

Horses and rabbits have a simple stomach with an extensive intestinal system and an enlarged__________

Page 14: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

Digestive System Mouth: “Prehension” tool (grasps food)

– ___________________secrete juices containing enzymes (digest food)

– Chewing food breaks down ____________: muscular tube that

connects mouth to stomach– Peristaltic Movement: sequential

contraction of ring like___________– Reverse ___________= blowing chunks

Page 15: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

Simple Stomach

Muscular contractions break down food Enzymes break down food:

– Gastric: ___________– Liver and ____________: fats

Page 16: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

3 Major Digestive Systems

All 3 systems will be addressed in detail in the lesson to follow:

__________________ __________________ __________________

Page 17: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and
Page 18: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and
Page 19: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

Digestive System _____________________: long coiled

tube connecting stomach to large intestine– rest of the digestion and _______________

takes place here– surface covered with ______(surface area)

___________: Cecum, colon, rectum– absorbs water (makes feces more solid)– some ________and minerals absorbed here– Cecal Fermenters (Horse): similar to rumen

Page 20: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

Digestive System

Accessory organs: Pancreas secretes _____________to

break down fat Liver (largest internal organ)

secretes____________, which digests fats– also stores_____________

Page 21: Introduction to the Digestive System. Digestive System n Large complex molecules broken down into simpler molecules n Long tube beginning with mouth and

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