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Digestive System Notes. Mouth. Esophagus. Stomach. Small Intestine. Large Intestine. System have BFS…. IC. I nterconnectedness C hanges. The “ BFS ”. B ehavior = Role (role of each part) F unction = Purpose (purpose of the whole system) S tructure = Parts

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Mouth

Esophagus

Stomach

Small Intestine

Large Intestine


System have bfs ic

System have BFS…. IC

Interconnectedness Changes


The bfs
The “BFS”

  • Behavior = Role (role of each part)

  • Function = Purpose (purpose of the whole system)

  • Structure = Parts

    BF  Behavior vs. Function

    Behavior is specific

    Function is general


System have bfs ic1
System have BFS…. IC

  • Interconnection – there are links between parts

  • Changes – If a part fails to perform, it will affect the whole system


How do the COMPONENTS of a SystemINTERCONNECT?


STRUCTURE OF SYSTEM


The digestive system
TheDigestiveSystem

Mouth / Teeth

Esophagus

Liver

Stomach

Small intestine

Large intestine

Rectum

Anus

Appendix


Observing digestive organs

OBSERVING DIGESTIVE ORGANS

  • The esophagus

  • a. How would you describe the esophagus?

  • b. How is it designed to perform its behavior?

  • 2.External and internal structure of the stomach.

  • a. How would you describe the external appearance of the stomach?

  • b. What is the action (behavior) of the stomach?

  • c. How is the stomach designed to perform its behavior?

  • 3. External and internal structure of the small and large

  • intestines

  • a. Describe the appearance of the small and large intestines.

  • b. What are the main actions (behavior) of the small and large intestines?

  • c. How is the small intestine designed to perform its behavior?


System

Digestive




  • breakdown of food  into molecular components small enough to cross the plasma membrane


Digestion
Digestion

Definition

  • Digestion is the breaking down of food into smaller and simpler substances

    • Mechanical digestion and Chemicaldigestion do this in different ways

ABSORBED

ELIMINATED


Digestion1
Digestion

Definition

  • MECHANICAL (physical) digestion

  • breaking down of food into smaller pieces

  • involves: chewing, grinding, churning

  • CHEMICAL digestion

  • Breaking down of food into simpler substances (building blocks)

  • involves: enzymes , bile, HCL acid

  • ABSORPTION

    • Broken down food gets from digestive tract into the body (blood)


  • Mechanical digestion

    saliva

    saliva

    saliva

    Mechanical Digestion

    Same volume of food

    Small total surface area

    Larger total surface area

    A larger surface area speeds up digestion


    Smaller pieces allow for more areas of contact for enzymes and digestive juices to act on speeding up digestion


    Digestion2
    Digestion and digestive juices to act on speeding up digestion

    Definition

    • Digestion is the breaking down of food into smaller and simpler substances

    • Mechanical digestion and Chemicaldigestion do this in different ways

    ABSORBED

    ELIMINATED


    Chemical Digestion and digestive juices to act on speeding up digestion is the breaking down of large complicated molecules into simpler ones by the use of enzymes


    http://web.ukonline.co.uk/webwise/spinneret/other/anenz.htm and digestive juices to act on speeding up digestion

    Orange- food

    Red and yellow- products

    ENZYME


    (glucose) and digestive juices to act on speeding up digestion


    Smaller pieces allow for more areas of contact for and digestive juices to act on speeding up digestionenzymes and digestive juices to act on speeding up chemical digestion

    CHEMICAL

    MECHANICAL


    Absorption
    Absorption and digestive juices to act on speeding up digestion

    passage of molecules into body's interior &passage throughout the body


    ELIMINATION OF WASTE and digestive juices to act on speeding up digestion

    LARGE INTESTINES

    REABSORBS WATER & SALTS


    STRUCTURE and digestive juices to act on speeding up digestion OF SYSTEM


    The digestive system1
    The and digestive juices to act on speeding up digestionDigestiveSystem

    Mouth / Teeth

    Esophagus

    Liver

    Stomach

    Small intestine

    Large intestine

    Rectum

    Anus

    Appendix


    Tongue Papillae and digestive juices to act on speeding up digestion

    Photograph by SPL/Photo Researchers, Inc.

    Cone-shaped tongue papillae, seen here in a colored scanning electron micrograph, contain nerve endings that receive and transmit touch sensations to the brain.

    As we begin chewing, the tongue shapes food in a ball-shaped bolus for swallowing.

    http://science.nationalgeographic.com/science/photos/digestive-system/?source=A-to-Z#/tongue-papillar_1251_600x450.jpg


    Inside the Human Mouth and digestive juices to act on speeding up digestion

    Photograph by Lennart Nilsson

    Inside the mouth, shown magnified here, teeth, tongue, and saliva work together to physically and chemically break down food.

    Humans produce up to 3 pints (1.4 liters) of saliva daily, and chemical enzymes in the saliva play a major role in disintegrating starchy foods.

    http://science.nationalgeographic.com/science/photos/digestive-system/?source=A-to-Z#/human-mouth_1002_600x450.jpg


    Epiglottis and digestive juices to act on speeding up digestion

    Animation

    Image source: http://www.umm.edu/imagepages/19595.htm


    This colored scanning micrograph shows a cast of blood vessels from the external wall of the small intestine.

    Measuring about 22 feet (6.7 meters) in length, the small intestine performs most of the major digestion and absorption of nutrients.

    The walls of the small intestine are lined with millions of projections called villi, which absorb and transmit nutrients into the bloodstream.

    http://science.nationalgeographic.com/science/photos/digestive-system/?source=A-to-Z#/small-intestine-vessels_1211_600x450.jpg


    VILLI vessels from the external wall of the small intestine.

    Image source:

    http://www.sciencephoto.com/media/310014/enlarge


    BEHAVIOR vessels from the external wall of the small intestine.


    http://www.whfoods.com/genpage.php?tname=faq&dbid=16#digestionhttp://www.whfoods.com/genpage.php?tname=faq&dbid=16#digestion

    Animation of Digestion


    http://www.youtube.com/watch?v=vFiavuyk31s&feature=relatedhttp://www.whfoods.com/genpage.php?tname=faq&dbid=16#digestion


    Wave-like contractionshttp://www.whfoods.com/genpage.php?tname=faq&dbid=16#digestion

    Peristalsis video clip

    Image source: http://media.photobucket.com/image/peristalsis/hurricane78_album/peristalsis.gif?o=2


    Image source: http://www.whfoods.com/genpage.php?tname=faq&dbid=16#digestion

    http://www.flickr.com/photos/liujoanne/2172007698/


    INTERCONNECTIONhttp://www.whfoods.com/genpage.php?tname=faq&dbid=16#digestion

    Digestion

    Absorption

    Elimination of Waste


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