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
Digestive System Notes
Mouth
Esophagus
Stomach
Small Intestine
Large Intestine
System have BFS…. IC
Interconnectedness Changes
The “BFS”
• Behavior = Role (role of each part)
• Function = Purpose (purpose of the whole system)
• Structure = Parts
BF Behavior vs. FunctionBehavior is specificFunction is general
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
System INTERCONNECT?
STRUCTURE OF SYSTEM
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
TheDigestiveSystem
Mouth / Teeth
Esophagus
Liver
Stomach
Small intestine
Large intestine
Rectum
Anus
Appendix
OBSERVING DIGESTIVE ORGANS1. 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?
INGESTION
FUNCTION/ PURPOSE OF SYSTEM
Digestionbreakdown of food into
molecular components small enough to cross the plasma membrane
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
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)
Mechanical DigestionSame volume of food
Small total surface areaLarger total surface area
A larger surface area speeds up digestion
saliva
saliva
saliva
Smaller pieces allow for more areas of contact for enzymes and digestive juices to act on speeding up digestion
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
Chemical 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
ENZYME
Orange- food Red and yellow- products
(glucose)
Smaller pieces allow for more areas of contact for enzymes and digestive juices to act on speeding up chemical digestion
MECHANICAL
CHEMICAL
Absorption
passage of molecules into body's interior &passage throughout the body
LARGE INTESTINES
ELIMINATION OF WASTE
REABSORBS WATER & SALTS
STRUCTURE OF SYSTEM
TheDigestiveSystem
Mouth / Teeth
Esophagus
Liver
Stomach
Small intestine
Large intestine
Rectum
Anus
Appendix
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.
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
Epiglottis
Image source: http://www.umm.edu/imagepages/19595.htm
Animation
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
Image source: http://www.sciencephoto.com/media/310014/enlarge
BEHAVIOR
http://www.whfoods.com/genpage.php?tname=faq&dbid=16#digestion
Animation of Digestion
http://www.youtube.com/watch?v=vFiavuyk31s&feature=related
Peristalsis video clip
Image source: http://media.photobucket.com/image/peristalsi
s/hurricane78_album/peristalsis.gif?o=2
Wave-like contractions
Image source:
http://www.flickr.com/photos/liujoanne/2172007698/
INTERCONNECTIONDigestion
Absorption Elimination of Waste