Cell Transport Learning Objectives Describe passive transport Describe
Cell Transport
Learning Objectives § Describe passive transport. § Describe active transport.
The Cell Membrane Maintains Homeostasis- Maintaining a constant internal environment Functions of the Cell Membrane: 1. The cell membrane- regulates what comes into and out of the cell 2. Provides structure and protection for the cell 3. Maintains homeostasis Phospholipids- Make up the cell membrane
Fluid Mosaic Model § Fluid= floating particles § Mosaic= All different components
Parts of the Cell Membrane 1. Phospholipid bilayer 2. Cholesterol- for rigidity 3. Peripheral proteins- don’t pass all the way through (structural support) 4. Integral Proteins- pass all the way through (transport) 5. Carbohydrate chains- cell communication and recognition
Passive Transport: Diffusion Solutes Outside Cell Membrane Inside Cell Higher concentration of solute on one side of the membrane than the other Diffusion causes net movement of solute particles from the side of the membrane with the higher solute concentration to the side with the lower solute concentration. At equilibrium, particles move equally in both directions, so there is no net change.
Passive Transport: Facilitated Diffusion
What’s Wrong with this picture? ?
Passive Transport: Osmosis aquaporin sugar water cell membrane
Osmosis
Osmosis in Cells Isotonic Hypertonic Hypotonic
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