Active Transport: Endocytosis & Exocytosis

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Presentation transcript:

Active Transport: Endocytosis & Exocytosis How do large molecules move in and out of our cells? How do single cell organisms “eat”? Active Transport: Endocytosis & Exocytosis

How and where do vesicles form? http://learn.genetics.utah.edu/content/cells/vesicles/

Animation: http://highered.mheducation.com/olcweb/cgi/pluginpop.cgi?it=swf::535::535::/sites/dl/free/0072437316/120068/bio02.swf::Endocytosis+and+Exocytosis

How does the structure (Fluid Mosaic Model) of the membrane allow it to change shape, break and re-form during endocytosis and exocytosis? Orientation of fatty acids (hydrophobic) and phosphate heads (hydrophillic) allow membrane to change shape because it is a fluid AND membrane can self-repair when vessicle buds off.

“exo” = out of, outside Excretion: Expulsion of waste materials Secretion: Export of digestive enzymes or hormones

3 Types of Endocytosis (“endo” = within, in) Phagocytosis = cellular “eating” Pinocytosis = cellular “drinking” Receptor-mediated Endocytosis Non-specific

Ex: Phagocytes/Monocytes/Neutrophils/T-lymphocytes Ex: single-celled organisms

Ex: used by mammalian cells to import cholesterol

Rules for Challenge: The candy must enter through a solid part of the bag (not through an opening already there) The inside of the bag may not be directly open to the external environment. The candies entering the bag must remain clustered together. Students may work with their hands in the bag to act as the inside of the cell. The candy may be eaten AFTER you show Alyssa your strategy.