Membrane Transport Outline

Membrane Transport
Christopher Gaita, Deija Williams, Elisabeth
Johnston & Megan Lade
University of Phoenix (Online Campus)
Amy Sullivan

Introduction: Membrane Transport
• What is membrane transport
• Types
–
–
–
–

Diffusion
Osmosis
Active Transport
Endocytosis/Exocytosis

Photo Courtesy Of: http://hyperphysics.phy-astr.gsu.edu/hbase/biology/celmem.html

Osmosis
• Example: A semipermeable membrane bag containing a 30% sugar solution is placed in a beaker of pure water.
– Diffusion or osmosis?
– What should we expect to see?
• Direction of molecular movement
Photo Courtesy Of: https://internationalgcsebiology.wikispaces.com/Movement+in+and+out+of+cells

• Example: The cell membrane of a nerve cell keeps 14 times as much sodium outside as