introducing cell transport
DESCRIPTION
Introducing Cell Transport. Cell Transport. Concentration Gradient Concentration – The amount of solute in a solution Gradient – A measure of how much something changes when you move from one region to another. Put ‘em together and what do you get? - PowerPoint PPT PresentationTRANSCRIPT
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Introducing Cell Transport
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Cell Transport
Concentration Gradient Concentration Gradient ConcentrationConcentration – The amount of solute in a – The amount of solute in a
solutionsolution GradientGradient – A measure of how much – A measure of how much
something changes when you move from one something changes when you move from one region to another.region to another.
Put ‘em together and what do you get?Put ‘em together and what do you get? Concentration GradientConcentration Gradient - measurement of - measurement of
how the concentration of something changes how the concentration of something changes from one place to another.from one place to another.
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Passive Transport
Passive TransportPassive Transport – Molecules moving from – Molecules moving from an area of high concentration to low an area of high concentration to low concentration.concentration. No energy needed No energy needed
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Diffusion
The process by which molecules spread from The process by which molecules spread from areas of high concentration, to areas of low areas of high concentration, to areas of low concentration.concentration. Equilibrium – Concentration is equal Equilibrium – Concentration is equal
throughout solution. throughout solution.
Diffusion Animation
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Osmosis
The movement of water molecules from high concentration to low concentration
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Osmosis
Hypertonic: Water diffuses out of cell (Cell Shrinks)
Hypotonic: Water diffuses into cell (Cell swells)
Isotonic: Equal rate of water diffusion into and out of the cell (Cell Stays the Same)
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Facilitated Diffusion
A form of diffusion facilitated by transport Proteins also known as carrier proteins
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Facilitated Diffusion
http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter2/animation__how_facilitated_diffusion_works.html
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Active Transport
Active Transport: The Transport of a substance across the cell membrane against its gradient
Requires Energy ( usually ATP)
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Sodium/Potassium Pump
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Bulk Transport
Endocytosis- The movement of a substance into a cell by a vesicle
Cell membrane forms pouch around substance and then pinches off
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Bulk Transport
Exocytosis- The movement of substance by a vesicle to the outside of a cell
Vesicles fuse with cell membrane
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Cells Must Be Small
All substances that enter or leave the cell must cross that cell’s surface
Small cells can exchange substances better than large cells
They don’t have to travel as far to reach the center
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Cell Size: Surface Area To volume