3.5 Active Transport, Endocytosis, and Exocytosis KEY CONCEPT Cells use energy to transport materials that cannot diffuse across a membrane.

3.5 Active Transport, Endocytosis, and Exocytosis Active transport requires energy input from a cell and enables a cell to move a substance against its concentration gradient (from lower to higher concentrations). Active transport is powered by chemical energy (ATP). Active transport occurs through transport protein pumps. Cells use active transport to maintain homeostasis.

Sodium-Potassium Pump http://highered.mheducation.com/sites/0072495855/student_view0/chapter2/animation__how_the_sodium_potassium_pump_works.html

3.5 Active Transport, Endocytosis, and Exocytosis A cell can import and export large materials or large amounts of material in vesicles during the processes of endocytosis and exocytosis. Cells use energy to transport material in vesicles. Endocytosis is the process of taking material into the cell. Phagocytosis is a type of endocytosis. It takes in solids. Pinocytosis takes in liquids.

3.5 Active Transport, Endocytosis, and Exocytosis A cell can import and export large materials or large amounts of material in vesicles during the processes of endocytosis and exocytosis. Cells use energy to transport material in vesicles. Exocytosis is the process of expelling material from the cell. https://www.youtube.com/watch?v=DuDmvlbpjHQ

Review: Study vocabulary Know your famous scientists p.67 Know the 3 parts to the cell theory p. 67 Difference between prokaryotic and eukaryotic cells Label a plant or animal cell p. 70 Know what the organelles do

Know the difference between these passive transport processes: Label a cell membrane p. 78 Know the difference between these passive transport processes: Diffusion Osmosis Facilitated diffusion Know the difference between these active transport processes: Protein pumps Endocytosis (phagocytosis and pinocytosis) Exocytosis