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Lecture 35

BIOL 1F90 Lecture 35: BIOL 1F90 lecture 35 winter 2016


Department
Biological Sciences
Course Code
BIOL 1F90
Professor
Fiona Hunter
Lecture
35

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Friday, April 1, 2016
BIOL 1F90
Lecture 35
-fluid feeders
-lick or suck fluids from plants or animals
-do not have teeth, except, perhaps to puncture an animals teeth
-evolved independently in many types of animals
-If you’re happy and you know it mitosis *mitosis* *mitosis*
Principles of Digestion and Absorption
-intracellular digestion
-only in some very simple invertebrates (sponges and some single-celled organisms)
-uses phagocytosis to bring food particles directly into a cell
-cannot meet metabolic demands of an active animal for long
-no mechanism for storing food
-extracellular digestion
-digestive enzymes
-protects interior of cells from hydrolytic enzymes
-can consume large food
-gastrovascular cavity
-single extracellular digestion
-one opening is entry and exit
-digestion and distribution of nutrients
-food particles eventually phagocytose
-alimentary canal
-single elongated tube with dierent entry and exit ends
-lined by epithelial cells
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