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Cell Transport

What is the function of the plasma membrane? Isolates the cells contents from environment
What are membranes? Membranes are dynamic, ever-changing structures
What are phospholipids? Phospholipids are the basis of membrane structure
What is a phospholipid head? 1 Polar, hydrophillic head
What is a phospholipid tail? 2 Non-polar, hydrophobic heads
Why is the phospholipid bilayer flexible and fluid? Allows for cellular shape changes
What makes the phospholipid membrane fluid? Unsaturated fatty acids
Where are proteins embedded? Phospholipid bilayer
What is the main role of a transport protein? Transport substances
What is a fluid? Substance that can move or change shape in response to external forces
What is a solute? Substance that can be dissolved in a solvent
What is a solvent? Fluid capable of dissolving a solute
What is concentration? Concentration is the number of molecules in any given volume unit
What is a gradient? Physical difference in concentration of two adjacent regions
What is diffusion? Molecules move from areas of high concentration to low concentration until a dynamic equilibrium is reached
Does diffusion ever stop moving? No!
What are the two types of movements across the plasma membrane? Passive transport and energy requiring transport
What is a selectively permeable membrane? Membrane that chooses which molecules may pass through and which may not
What is passive transport? Substances move down their concentration gradient across a membrane.
What is allowed through the cell membrane? Small, non-polar molecules (no charge)
What is not allowed through the cell membrane? Charged, polar, and large molecules
Is energy required in diffusion? No!
How do molecules distribute themselves? Equally
What is osmosis? Water diffuses from high concentration to low concentration across a membrane (Water only!)
What is a hypotonic solution? High water concentration, lower dissolved solutes
What is a hypertonic solution? Low water concentration, high dissolved solutes
What is an isotonic solution? Equal concentrations of solutes in water and in cell
What is water attracted to? Things with a charge; solutes
What is facilitated diffusion? Water soluble molecules (like ions, amino acids, and sugars) diffuse with the aid of carrier transport proteins
What aids facilitated diffusion? Carrier transport proteins
What is active transport? Energy pumps solutes from areas of low concentration to high concentration (opposite of diffusion)
What concentrations does active transport go from? Low to high
What concentration does diffusion go through? High to low
What is the main role of membrane proteins? Transport important substanecs
What is bulk transport known as? Endocyotsis
What is pinocytosis? Cell drinking
What is phagocytosis? Cell eating
What is exocytosis? Vesicles join membrane, dumping out contents
Does exo/endocytosis require energy? Yes, lots of it!
Created by: 220ccarmody



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