digestive system notes
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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Digestive System Notes
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Mouth
Esophagus
Stomach
Small Intestine
Large Intestine
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System have BFS…. IC
Interconnectedness Changes
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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
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System have BFS…. IC
• Interconnection – there are links between parts
• Changes – If a part fails to perform, it will affect the whole system
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How do the COMPONENTS of a
System INTERCONNECT?
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STRUCTURE OF SYSTEM
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The Digestive System Use the words below to label the parts of the digestive system. Liver large intestine appendix anus oesophagus rectum small intestine stomach mouth
The Digestive System Use the words below to label the parts of the digestive system. Liver large intestine appendix anus oesophagus rectum small intestine stomach mouth
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TheDigestiveSystem
Mouth / Teeth
Esophagus
Liver
Stomach
Small intestine
Large intestine
Rectum
Anus
Appendix
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OBSERVING DIGESTIVE ORGANSOBSERVING DIGESTIVE ORGANS
1.1. The esophagusThe esophagus
a. How would you describe the esophagus? a. How would you describe the esophagus?
b. How is it designed to perform its behavior?b. How is it designed to perform its behavior?
2.2. External and internal structure of the stomachExternal and internal structure of the stomach..
a. How would you describe the external appearance of the stomach?a. How would you describe the external appearance of the stomach?
b. What is the action (behavior) of the stomach?b. What is the action (behavior) of the stomach?
c. How is the stomach designed to perform its behavior?c. How is the stomach designed to perform its behavior?
3. External and internal structure of the small and large 3. External and internal structure of the small and large
intestinesintestines
a. Describe the appearance 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?b. What are the main actions (behavior) of the small and large intestines?
c. How is the small intestine designed to perform its behavior?c. How is the small intestine designed to perform its behavior?
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INGESTIONINGESTION
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FUNCTION/ PURPOSE OF SYSTEM
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DigestioDigestionnbreakdown of food
into molecular components small enough to cross the plasma membrane
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DigestionDefinition• Digestion is the breaking down of food into
smaller and simpler substances
– Mechanical digestion and Chemical digestion do this in different ways
ABSORBED ELIMINATED
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DigestionDefinition• 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)
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Mechanical DigestionSame volume of food
Small total surface areaLarger total surface area
A larger surface area speeds up digestion
saliva
saliva
saliva
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Smaller pieces allow for more areas of contact for enzymes and digestive juices to act on speeding up digestion
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DigestionDefinition• Digestion is the breaking down of food into
smaller and simpler substances
• Mechanical digestion and Chemical digestion do this in different ways
ABSORBED ELIMINATED
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Chemical Digestion is the breaking down of large complicated molecules into simpler ones by the use of enzymes
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http://web.ukonline.co.uk/webwise/spinneret/other/anenz.htm
ENZYME
Orange- foodOrange- food Red and yellow- Red and yellow- productsproducts
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(glucose)(glucose)
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Smaller pieces allow for more areas of contact for enzymes and digestive juices to act on speeding up chemical digestion
MECHANICAL
CHEMICAL
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Absorption
passage of molecules into body's interior &passage throughout the body
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LARGE INTESTINES
ELIMINATION OF WASTE
REABSORBS WATER & SALTS
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STRUCTURE OF SYSTEM
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TheDigestiveSystem
Mouth / Teeth
Esophagus
Liver
Stomach
Small intestine
Large intestine
Rectum
Anus
Appendix
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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
Tongue PapillaePhotograph by SPL/Photo Researchers, Inc.
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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
Inside the Human MouthPhotograph by Lennart Nilsson
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Epiglottis
Image source: http://www.umm.edu/imagepages/19595.htm
Animation
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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
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VILLI
Image source: http://www.sciencephoto.com/media/310014/enlarge
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BEHAVIOR
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http://www.whfoods.com/genpage.php?tname=faq&dbid=16#digestion
Animation of Digestion
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http://www.youtube.com/watch?v=vFiavuyk31s&feature=related
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Peristalsis video clip
Image source: http://media.photobucket.com/image/peristalsi
s/hurricane78_album/peristalsis.gif?o=2
Wave-like contractions
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Image source:
http://www.flickr.com/photos/liujoanne/2172007698/
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INTERCONNECTIONDigestion
AbsorptionElimination of
Waste