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Title:

Digestive System

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Mechanical vs. Chemical Digestion. Chemical Digestion. Chemical breakdown of food into particles so small that they are able to be absorbed into the bloodstream and ... – PowerPoint PPT presentation

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Title: Digestive System


1
Digestive System
2
Digestive System
  • The digestive system can be divided into two
    parts
  • Alimentary canal open ended muscular tube that
    forms a digestive tract between the mouth and the
    anus of an organism
  • Accessory organs organs which produce
    secretions that assist in the digestive of food
    food does not pass through these organs

3
Digestive System
4
Steps in the Digestive Process
  •  
  • INGESTION
  • The process of taking food into the body by the
    mouth
  •  
  •  
  • DIGESTION
  • The process of breaking food down into smaller
    components
  • Two types of digestion
  • a) Mechanical Digestion b) Chemical Digestion
  •  
  •  

5
Steps in the Digestive Process
  • ABSORPTION
  • Involves broken down food particles leaving the
    digestive tract and moving to the blood transport
    system
  • 80 of absorption occurs in the small intestine
  • 20 of absorption occurs in the stomach and large
    intestine
  • EGESTION
  • Removal of solid waste (materials not absorbed by
    the body)

6
Mechanical vs. Chemical Digestion
  • Mechanical Digestion
  • Physical breakdown of food into smaller parts (no
    chemical change)
  • Involves primarily the MOUTH (biting, tearing,
    grinding, chewing) and STOMACH (muscular
    churning)

7
Mechanical vs. Chemical Digestion
  • Chemical Digestion
  • Chemical breakdown of food into particles so
    small that they are able to be absorbed into the
    bloodstream and into the cells of the body.
  • The chemical breakdown of food involves ENZYMES
    and DIGESTIVE JUICES.
  • Enzyme protein that speeds up the rate of a
    biological reaction without being used up in the
    reaction

8
Major Parts of the Digestive System
  • Mouth
  • Aids in mechanical breakdown
  • Releases enzymes for chemical digestion
  • Releases saliva to soften food
  • Easier to pass into esophagus

9
Major Parts of the Digestive System
  • Esophagus
  • Muscular tube connecting mouth to stomach
  • Contains smooth muscle tissue
  • Allows esophagus to relax and contract
  • Contractions allow food to move along ?
    peristalsis

10
Major Parts of the Digestive System
  • The Stomach
  • Main function ? to hold and churn food
  • Stomach lining secretes digestive enzymes and
    acids
  • Smooth muscle ? allows stomach to contract to mix
    stomach contents

11
Major Parts of the Digestive System
  • The Intestine
  • Between stomach and anus
  • Has cells that secrete mucus ? helps lubricate
    food
  • Has lots of blood vessels interlaced through it
  • allows nutrients to be absorbed into the blood
    from the digesting food

12
Major Parts of the Digestive System
  • The Intestine
  • Small Intestine
  • Approx 6 m long and narrow
  • Most absorbing of food nutrients occurs here
  • Large Intestine
  • A.k.a. Colon
  • 1.5 m long but bigger in diameter
  • Most absorbing of water occurs here
  • Remaining solid matter excreted as feces

13
Accessory Organs
  • Liver
  • Produces bile ? helps with digesting food
  • Detoxifies substances in the body
  • Pancreas
  • Releases enzymes
  • Important hormone released ? insulin
  • Allows our cells to use the sugars we ingest
  • Gallbladder
  • Stores and releases acids to help in the
    digestion of food

14
Accessory Organs
15
Homework
  • Booklet Questions 1-6
  • Answer 2 -5 on page 82
  • Additional Question
  • Describe what heart burn is. (Hint you can
    find the info on page 81)
  • Study for circulatory and respiratory systems quiz
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