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1­12­16 Digestive System.notebook
As the Stomach Churns
January 13, 2016
Tuesday
January 12, 2016
Objective: You will examine the different organs of the digestive system and investigate the difference between mechanical and chemical digestion.
Homework: Finish BrainPop Worksheet(pg. 23a)
Quiz on Friday, Jan. 22
Heart & Digestive Systems
Classwork: Collect page 16a for grading
BrainPop Worksheet(pg. 23a)
Intro to Digestive System
Digestion Notes Foldable (pg. 23b)
1­12­16 Digestive System.notebook
January 13, 2016
Not on foldable
Digestive System Pre­Assessement
• 1. What does your digestive system do?
• 2. What organs do you think help with digestion AND what do they do?
1­12­16 Digestive System.notebook
Not on foldable
What is the function?
• Breaks down into usable nutrients.
• absorb nutrients • get rid of solid waste
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1­12­16 Digestive System.notebook
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Digestive Foldable
1­12­16 Digestive System.notebook
January 13, 2016
Digestive System Notes for foldable
Summarize notes for foldable
1­12­16 Digestive System.notebook
January 13, 2016
1­12­16 Digestive System.notebook
January 13, 2016
1­12­16 Digestive System.notebook
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How is food broken down?
• Mechanical Digestion
• Chemical Digestion
Mechanical vs Chemical Digestion ­ Foldable
1­12­16 Digestive System.notebook
Mechanical Digestion
• Occurs in the mouth and stomach
• Teeth – tears, grinds, breaks into smaller pieces
• Stomach – muscles mix the stomach contents
January 13, 2016
1­12­16 Digestive System.notebook
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Chemical Digestion
• Mouth ­ saliva contains enzymes that break down carbohydrates (starches and sugars)
• An enzyme is a chemical that causes chemical reactions in other substances
• Stomach – acids (ex. hydrochloric acid) dissolves and breaks food down
• Small Intestine 1­12­16 Digestive System.notebook
Chemical Digestion
• Most occurs in the small intestine!!!!
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1­12­16 Digestive System.notebook
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Main Parts
•
•
•
•
•
Mouth/Salivary Glands
Esophagus
Stomach
Small Intestines
Large Intestines
• Accessory organs : Liver, pancreas and gall bladder
1­12­16 Digestive System.notebook
January 13, 2016
1­12­16 Digestive System.notebook
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1­12­16 Digestive System.notebook
Occurs in the esophagus!
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1­12­16 Digestive System.notebook
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1­12­16 Digestive System.notebook
Small Intestine
• The majority of digestion takes place in the small intestine.
• This organ is not given its name by its length but by its diameter.
January 13, 2016
1­12­16 Digestive System.notebook
Absorption of Nutrients
• Most occurs in the small intestines by villi.
• Villi are fingerlike projections in the small intestines. • Villi are surrounded by blood vessels (capillaries)
• Blood transports nutrients to the entire body
January 13, 2016
1­12­16 Digestive System.notebook
Large Intestine
• The large intestine stores the
remaining digested food anywhere
from 18 ­24 hours.
• The excess water is absorbed into
the bloodstream before being
removed as waste.
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1­12­16 Digestive System.notebook
January 13, 2016
Accessory Organs
• Liver – produces bile
• Bile is a chemical that helps the body break down fats
• cleans toxins from blood – blood leaving small intestine goes directly to the liver
• Gall Bladder – stores bile from the liver
• Bile is added to the small intestine
• Pancreas – produces insulin that breaks down carbohydrates and regulates sugar levels • Insulin lowers acid levels
1­12­16 Digestive System.notebook
Questions????
January 13, 2016
1­12­16 Digestive System.notebook
January 13, 2016
How does the mouth contribute to the process of digestion?
• The teeth grind and tear food and saliva contains enzymes that begin the chemical breakdown of food. 1­12­16 Digestive System.notebook
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Explain how your stomach helps break down food.
• The stomach muscles churns and mixes food to continue the process of mechanical breakdown. Chemical digestion occurs as acids dissolve food into a liquid.
1­12­16 Digestive System.notebook
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Explain the relationship between food and nutrients. • After the food is broken down, we call the usable pieces nutrients. Examples of nutrients are water, proteins, fats, and carbohydrates. 1­12­16 Digestive System.notebook
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What role(s) does your small intestine play in digestion? • The small intestines is where most chemical digestion occurs. Most of the substances produced by the breakdown of food is absorbed into blood by villi in the small intestines. 1­12­16 Digestive System.notebook
January 13, 2016
Explain how the digestive and circulatory systems work together? The walls of the small intestine are lined with villi. These are surrounded by capillaries which absorb the nutrients into the bloodstream and send them to the body cells.
(what does this remind you of)? 1­12­16 Digestive System.notebook
January 13, 2016
Why does blood travel to your liver before transporting nutrients to other parts of the body?
• Blood first travels to the liver to remove the toxins (poisons).