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Do Now Please take 2 minutes to answer this question: Agenda
Objectives Membrane transport Passive transport Osmosis Active transport Closing Please take 2 minutes to answer this question: Who brings the groceries into your house? Who takes out the garbage out of your house? How were those jobs decided?
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Do Now Please take 2 minutes to answer this question: Agenda
Objectives Membrane transport Passive transport Osmosis Active transport Closing Please take 2 minutes to answer this question: Please write down an example of something “passive” and one example of something “active”
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Objectives Agenda Do Now Objectives Membrane transport Passive transport Osmosis Active transport Closing Content: Describe the terms: selective permeability, diffusion, dialysis, and osmosis Compare and contrast passive and active transport Language: Summarize the importance of moving “things” into and out of the cell.
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Cellular Physiology: Membrane Transport
Agenda Do Now Objectives Membrane transport Passive transport Osmosis Active transport Closing Membrane Transport – movement of substance into and out of the cell Transport is by two basic methods Passive transport No energy is required Active transport The cell must provide metabolic energy
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Solutions and Transport
Agenda Do Now Objectives Membrane transport Passive transport Osmosis Active transport Closing Solution – homogeneous mixture of two or more components Solvent – dissolving medium Solutes – components in smaller quantities within a solution Intracellular fluid – nucleoplasm and cytosol Interstitial fluid – fluid on the exterior of the cell
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Selective Permeability
Agenda Do Now Objectives Membrane transport Passive transport Osmosis Active transport Closing The plasma membrane allows some materials to pass while excluding others This permeability includes movement into and out of the cell
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Passive Transport Processes
Agenda Do Now Objectives Membrane transport Passive transport Osmosis Active transport Closing Diffusion Particles tend to distribute themselves evenly within a solution Movement is from high concentration to low concentration, or down a concentration gradient PRESS TO PLAY DIFFUSION ANIMATION Figure 3.9
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Passive Transport Processes
Agenda Do Now Objectives Membrane transport Passive transport Osmosis Active transport Closing Types of diffusion Simple diffusion Unassisted process Solutes are lipid-soluble materials or small enough to pass through membrane pores
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Passive Transport Processes
Agenda Do Now Objectives Membrane transport Passive transport Osmosis Active transport Closing Types of diffusion Osmosis – simple diffusion of water Highly polar water easily crosses the plasma membrane Facilitated diffusion Substances require a protein carrier for passive transport
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Diffusion through the Plasma Membrane
Agenda Do Now Objectives Membrane transport Passive transport Osmosis Active transport Closing Figure 3.10
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Passive Transport Processes
Agenda Do Now Objectives Membrane transport Passive transport Osmosis Active transport Closing Filtration Water and solutes are forced through a membrane by fluid, or hydrostatic pressure A pressure gradient must exist Solute-containing fluid is pushed from a high pressure area to a lower pressure area
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Active Transport Processes
Agenda Do Now Objectives Membrane transport Passive transport Osmosis Active transport Closing Transport substances that are unable to pass by diffusion They may be too large They may not be able to dissolve in the fat core of the membrane They may have to move against a concentration gradient Two common forms of active transport Solute pumping Bulk transport
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Active Transport Processes
Agenda Do Now Objectives Membrane transport Passive transport Osmosis Active transport Closing Solute pumping Amino acids, some sugars and ions are transported by solute pumps ATP energizes protein carriers, and in most cases, moves substances against concentration gradients PRESS TO PLAY ACTIVE TRANSPORT ANIMATION
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Active Transport Processes
Agenda Do Now Objectives Membrane transport Passive transport Osmosis Active transport Closing Figure 3.11
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Active Transport Processes
Agenda Do Now Objectives Membrane transport Passive transport Osmosis Active transport Closing Bulk transport Exocytosis Moves materials out of the cell Material is carried in a membranous vesicle Vesicle migrates to plasma membrane Vesicle combines with plasma membrane Material is emptied to the outside
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Exocytosis Agenda Do Now Objectives Membrane transport
Passive transport Osmosis Active transport Closing Figure 3.12a
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Active Transport Processes
Agenda Do Now Objectives Membrane transport Passive transport Osmosis Active transport Closing Bulk transport Endocytosis Extracellular substances are engulfed by being enclosed in a membranous vescicle Types of endocytosis Phagocytosis – cell eating Pinocytosis – cell drinking
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Endocytosis Agenda Do Now Objectives Membrane transport
Passive transport Osmosis Active transport Closing Figure 3.13a
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Closing/Homework Content:
Agenda Do Now Objectives Membrane transport Passive transport Osmosis Active transport Closing Content: Describe the terms: selective permeability, diffusion, dialysis, and osmosis Compare and contrast passive and active transport Language: Summarize the importance of moving “things” into and out of the cell.
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