3.5 Active Transport, Endocytosis, and Exocytosis

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Presentation transcript:

3.5 Active Transport, Endocytosis, and Exocytosis MA 2.1 Explain the role of cell membranes as a highly selective barrier (diffusion, osmosis, facilitated diffusion, active transport).

*two page notebook format* Do Now: 1) Compare and contrast an escalator and an elevator. Thursday, October 1, 2015 Topic: Active Transport across a cell membrane Objectives: Describe active transport Distinguish among endocytosis, phagocytosis, and exocytosis. Agenda Homework check 3.4 Video – active and passive transport Notes & problems 3.5

Compare and contrast: escalator and elevator

Moving materials against the concentration gradient Escalator is like active transport Elevator is like endocytosis/exocytosis Proteins can move materials in a pathway Energy is used to move from LOWER to HIGHER concentration – against the concentration gradient Materials become MORE concentrated – ions, glucose, etc. The membrane itself can surround material in little packages to move it. Usually large substances, or large amounts at one time. Endocytosis moves things into the cell – phagocytosis is the special name for “cell eating” Exocytosis moves things out of the cell.

Video illustration <iframe width="420" height="315" src="https://www.youtube.com/embed/kfy92h daAH0" frameborder="0" allowfullscreen></iframe> https://youtu.be/kfy92hdaAH0 <iframe width="420" height="315" src="https://www.youtube.com/embed/prfMU wjobo8" frameborder="0" allowfullscreen></iframe> https://youtu.be/prfMUwjobo8

Classwork/Homework Complete pages 49-50 of your student book during class Complete Chapter 3 review, page 51 If you have not yet shared your cell project to me, do so now!