UW-Madison BIOLOGY 101 - Small Intestine, Large Intestine, Respiration (2 pages)

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Small Intestine, Large Intestine, Respiration



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Small Intestine, Large Intestine, Respiration

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Lecture number:
21
Pages:
2
Type:
Lecture Note
School:
University of Wisconsin, Madison
Course:
Biology 101 - Zoology 101: Animal Biology
Edition:
1
Documents in this Packet

Unformatted text preview:

Zoology 101 Animal Biology Last Lecture Outline Lecture 21 1 Finish up of last lecture and Fermentation 2 Energy and exchange Current Lecture Outline 1 Small intestine 2 Large Intestine 3 Respiration 4 Beginning of Tracheal system Small Intestine Chemical digestions in duodenum aided by accessory organs Pancreatic amylase carbs Pancreatic proteases proteins Trypsin chymotrypsin Secreted as inactive precursors trypsinogen chymotrysinogen activated in small intestine Pancreatic nuclease nucleic acids pancreatic lipase fats Mechanical digestion bile emulsifies breaks into smaller globules fat larger surface area for lipase Bile made in liver stored in gallbladder Absorption exchange into circulation across small intestine jejunum and ilium Big folds have folds villi single layer lined with epithelial cells exchange Supplied with blood capillaries Lacteals center of villi Circulatory Microvilli on the actual epithelial cells have folds on lumen side brush border Fats chylomicrons lipoprotein complexes lacteals lymph system blood stream All other molecules capillaries Large Intestine We want to get rid of undigested material while still conserving water elimination Reabsorption of water waste undigested material becomes more solid feces eliminated from the body Microbiome Tight junctions protein connections connect epithelial cells lining digestive system Hold cells together Inhibit movement of dissolved materials through the space between cells Problems Crohn s cancer diarrhea Intestinal adaptations Herbivore cellulose cell walls are hard to digest longer small intestine to allow more time for chemical digestion to occur more surface area for absorption omnivore shorter small intestine Cecum pouch anaerobic chamber contains cellulose digesting microbes big in herbivores Ruminents herbivores rumen contains cellulose digesting microbes Bird digestive system is adapted for flight mechanical digestion gizzard muscular action and small rocks and crop expandable storage



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