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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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slide2

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
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?
slide12

System

Digestive

slide15

Digestion

  • 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

slide20

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

digestion2
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

slide22

Chemical Digestion is the breaking down of large complicated molecules into simpler ones by the use of enzymes

slide23

http://web.ukonline.co.uk/webwise/spinneret/other/anenz.htm

Orange- food

Red and yellow- products

ENZYME

slide25

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

CHEMICAL

MECHANICAL

absorption
Absorption

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

slide27

ELIMINATION OF WASTE

LARGE INTESTINES

REABSORBS WATER & SALTS

the digestive system1
TheDigestiveSystem

Mouth / Teeth

Esophagus

Liver

Stomach

Small intestine

Large intestine

Rectum

Anus

Appendix

slide30

Tongue Papillae

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

slide31

Inside the Human Mouth

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

slide32

Epiglottis

Animation

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

slide33

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

slide34

VILLI

Image source:

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

slide36

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

Animation of Digestion

slide38

Wave-like contractions

Peristalsis video clip

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

slide39

Image source:

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

slide40

INTERCONNECTION

Digestion

Absorption

Elimination of Waste

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