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bio101 fall2010 lab midterm review

bio101 fall2010 lab midterm review - Learningobjective1...

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Minicourse 1- Digestive and Excretory Systems Learning objective 1 Be able to explain the differences and similarities in digestive system of paramecium, pig (mammals), and  hydra. What are intracellular and extracellular digestions?, which organism use each type of digestion?, how  and why?. You need to also be able to compare any of the three organisms mentioned above to the roach and  chicken.  Intracellular digestion: the breaking down of food particles  inside the cell   Paramecium: Digestive vacuole     : the enzymes break down the food particles into units small enough to be  pass through the vacuole wall and into the cell Extracellular digestion: the breaking down of food particles  outside the cell Human, fetal pig: Stomach     : the mechanical breakup of food Small intestine     : the chemical breakdown and absorption of food into blood stream Combination Hydra: Extracellular digestion: gland cells secrete digestive enzymes into the  gastrovascular cavity   where they break food into particles small enough to be engulfed by the digestive cells Intracellular digestion: digestive cells engulf the food particles by phagocytosis, packed them  into  digestive cells , and then use enzymes form lysosomes to complete the digestive process Learning Objective 2 Table 3, page 1-16 . KNOW IT and UNDERSTAND IT. Also be able to relate to the cockroach and chicken  even though these two organisms are not on the table. In other words, be prepare to compare and contrast  cockroach and paramecium or any other combination of organisms that you came upon during lab. You need  to know also the  location/function   of each structure in each of the organism you studied during lab.  Type of  Digestion Intracellular Extracellular Extracellular Extracellular Combination Example(s) Paramecium Pig(human) Chicken Cockroach Hydra Storage before  food vacuole stomach crop crop gastrovascular  1
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digestion cavity Mechanical breakup by none teeth, tongue, hard palate gizzard proventriculus none Chemical breakdown in digestive vacuole small intestine stomach small intestine midgut gastrovascular cavity, digestive cells Source of digestive enzymes lysosome pancreas pancreas gastric caeca gland cells Absorption through digestive vacuole small intestine small intestine large intestine midgut digestive cells Storage after digestion digestive  vacuole rectum rectum rectum gastrovascular  cavity Undigested  food leaves by  way of anal pore anus cloaca anus mouth Learning Objective 3 If you understand the major structures involved in digestion in each organism, you’ve achieved this objective  without any problem. Learning Objective 4
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