cell membrane transport - hortonville area school district transport 2018.pdfthe cell membrane...
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The cell membrane allows molecules in and out in order to maintain homeostasis.
Concentration gradient: difference in concentration of a substance across a space.
Equilibrium: equal concentration of the substance throughout that space.
Cell Membrane Transport1. Passive Transport no energy is used2. Active Transport energy is used
(balance)
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Movement of substance from area of: high concentration to area of low concentration.
____________________________
Examples of Passive Transport:
1. Diffusion:
can be across a membrane
N0 ENERGY perfume
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2. Osmosis: diffusion of water across a membrane
*Sore Throat Remedy
Example of Passive TransportN0 ENERGY
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3. Facilitated Diffusion• passive transportNO energy (happens down a concentration gradient)
• uses transport proteins
• used by particles that are too big or too polar to diffuse through membrane.
Example of Passive Transport"Aided" N0 ENERGY
mem
brane
protein
mem
brane
protein
http://highered.mcgrawhill.com/sites/dl/free/0072464631/291136/facDiffusion.swf
high
low
equal on both sides
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simple diffusion facilitated diffusion
goes through: lipid bilayer transport protein
particles: small and nonpolar large and polar
What is the difference between simple and facilitated diffusion?
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Active Transport
Transport of certain substances across the membrane against the concentration gradient.
This means from _________ concentration to __________ concentration.
Cytoplasm Outside Cell
Carrier Proteins
ATP
Requires ENERGY!
lowhigh
lowhigh
Need ATP
(Energy)
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Sodium Potassium Pump: transports sodium out of cell and potassium into cell
* Uses ATP (energy)
Example of Active Transport
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Review
2 types of transport?
Example(s) of each?
Which type of transport uses energy?does not use energy?
Which type goes "up" or "against" the gradient?
Define and draw an example of:concentration gradientequilibrium
"down" or "with" the gradient?Which types of transport require a membrane protein?
Draw a lipid bilayer and label it.
Define osmosis
2 functions of cell membrane?