the digestive system and nutrition
Download
Skip this Video
Download Presentation
The Digestive System and Nutrition

Loading in 2 Seconds...

play fullscreen
1 / 15

the digestive system and nutrition - PowerPoint PPT Presentation


  • 197 Views
  • Uploaded on

The Digestive System and Nutrition. 7 th Grade Science Mrs. Christopherson Mrs. Goede. Important Vocabulary. Digestion : The process of breaking food down to be used by the body. Why is digestion important?

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'the digestive system and nutrition' - albert


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
the digestive system and nutrition

The Digestive System and Nutrition

7th Grade Science

Mrs. Christopherson

Mrs. Goede

important vocabulary
Important Vocabulary
  • Digestion: The process of breaking food down to be used by the body.
    • Why is digestion important?
      • Food must be broken down in order for our body to be able to absorb all of the substances important for daily functions.
      • Food must small enough to be absorbed into the blood and carried to the cells.
important vocabulary3
Important Vocabulary
  • Digestion cont:
    • Two types of digestion:
      • Mechanical Digestion: occurs in the mouth (chewing), and in the stomach (churning of stomach muscles)
      • Chemical Digestion: occurs through the use of enzymes (substances which chemically act on food to break it down) in saliva, the stomach, in the small intestine
important vocabulary organs of the digestive system
Important Vocabulary: Organs of the Digestive System
  • Mouth: The first step in digestion is actually getting the food into your body.
    • Teeth: mechanically break food down into smaller pieces
    • Saliva: softens food and chemically breaks food down further
    • Tongue: moves food around the mouth, forms a bolus (ball of food)
important vocabulary organs of the digestive system6
Important Vocabulary: Organs of the Digestive System
  • Esophagus: a hollow tube at the back of the throat that connects to the stomach.
    • To prevent food from “going down the wrong pipe” a flap of skin called the epiglottis closes over the opening of the trachea (windpipe) when we swallow
    • Peristalsis: muscular contractions that move food down the esophagus into the stomach.
      • Imagine squeezing a tube of toothpaste…
important vocabulary organs of the digestive system7
Important Vocabulary: Organs of the Digestive System
  • Stomach: a hollow, J-shaped organ located below the esophagus and above the small intestine.
    • The stomach uses both mechanical and chemical digestion to break food particles down.
      • Mechanical digestion: 3 layers of muscles
      • Chemical digestion: digestive or gastric enzymes
important vocabulary organs of the digestive system9
Important Vocabulary: Organs of the Digestive System
  • Small Intestine: responsible for absorbing nutrients from food.
    • First 1/3 of the S.I. :Bile from the gall bladder and digestive enzymes from the pancreas and walls of the small intestine further break food down.
    • Second 1/3 of the S.I.: contains finger-like projections called villi
important vocabulary organs of the digestive system10
Important Vocabulary: Organs of the Digestive System
  • Small Intestine cont:
    • Villi: increase the surface area of the S.I. so that more nutrients can be absorbed into the blood stream
important vocabulary organs of the digestive system11
Important Vocabulary: Organs of the Digestive System
  • Large intestine: “large” because it is wider in diameter than the small intestine (about 3” vs. 1”). Responsible for absorbing water from undigested food.
    • Material found in the large intestine is mostly food that cannot be digested any further and water.
important vocabulary organs of the digestive system12
Important Vocabulary: Organs of the Digestive System
  • Large Intestine: 3 parts
    • Colon: Absorbs water and nutrients from food, as the material moves through the colon it gets harder and harder-turning into feces.
    • Rectum: Stores feces. Feces move to the anus by peristalsis.
    • Anus: Eliminates solid waste from the body
other organs
Other Organs
  • Liver: produces bile, is located to the right of the stomach.
    • Bile: responsible for breaking down fats
  • Pancreas: located behind the stomach, and above the small intestine.
    • Secretes digestive enzymes
  • Gall Bladder: stores and excretes bile
ad