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Lesson Opening!!!
CYSTIC FIBROSIS
Currently affects more than 30,000 children and young adults in US
Disrupts epithelial cells Thick, sticky mucus Difficulty developing
Movement of Materials
The Cell Membrane
Plasma Membrane(aka Cell Membrane)
Phosopholipid Bilayer
Called the Fluid Mosaic Model
Selectively Permeable
Selectively PermeableIf a membrane is selectively permeable only certain things can pass through
The Cell Membrane is Selective:
Things that passively cross: Non-Polar Molecules (Alcohols, Steroids) Small Molecules (Water)
Things that actively cross: Polar Molecules (Ions) Large Molecules
Active (requires energy)
Passive (no energy)
Types of Transport
Osmosis
Passive
Passive Transport
Diffusion
Facilitated Diffusion
Passive Transport
Passive Transport
Movement of materials that DOES NOT require energy (ATP)
What is happening here???
DIFFUSIONThe passive movement of material from an area of high concentration to an area of low concentration
ConcentrationThe number of a substance in a specific area
High Concentration Low
Concentration
Pass
ive
Tra
nspo
rt
High Concentration
Low Concentration
Factors Affecting DiffusionConcentration—diffusion always goes
from high concentration to low concentration
Temperature—the higher the temperature, the faster diffusion occurs
Molecular Size—the bigger the molecule, the longer diffusion takes
Osmosis
Passive
Passive Transport
Diffusion
Facilitated Diffusion
OSMOSISThe diffusion of water through a selectively permeable membrane
Facilitated DiffusionDiffusion that is helped by proteins in the membrane
Facillitated Diffusion
3 TYPES OF SOLUTIONS
These three different types of Solutions deal with Concentration Levels
Types of Solutions
Isotonic SolutionNo net movement of water in or out of the cell
Isotonic:
Red Blood Cell stays the same
Hypotonic Solution
Water moves from the solution into the cell causing it to swell or break (lysis)
Hypotonic:
Red Blood Cell Expands
Hypertonic Solution
The water moves out of the cell into the solution, causing the cell to shrink
Hypertonic:
Red Blood Cell Shrinks
Types of Solutions
Another way to remember
Isotonic Drink – you are fine Hypotonic Drink – you bloat up Hypertonic Drink – you shrivel up
Isotonic Drink – you pee normally Hypotonic Drink – you pee all the time Hypertonic Drink – you never pee
Explain what is
happening in this
cartoon…
REAL LIFE TIDBIT
Reverse Osmosis “Dasani” Apply external pressure to concentrated solution
making water molecules diffuse from concentrated solution to dilute solution (leaves solutes / dirt on other side)
Osmosis
Passive
Passive Transport
Diffusion
Facilitated Diffusion
Osmosis
Passive
Passive Transport
Diffusion
Facilitated Diffusion
You Should now have notes for all of these. Look at the Organization of Passive Transport
MembraneMovements
Active
Active Transport
Pumps
Endocytosis Exocytosis
Requires Energy
Sodium Potassium Pump
Active TransportRequires Energy
Active Transport
Movement of materials from low concentration to high concentration using a protein carrier that requires energy (costs ATP)
Active T
ransportHigh Concentration
Low Concentration
What is ATP again???You do not need to copy this.
Sodium Potassium Pump
Pumps sodium out and potassium into cells Important for Action Potentials
Active Transport
Endocytosis
Process of bringing particles into a cell using extensions of the cellular membrane
ENDOCYTOSIS
Exocytosis
Process of moving particles out of a cell using extensions of the cellular membrane (how wastes are excreted from cells)
EXOCYTOSIS
Endocytosis y Exocytosis
Phagocytosis
The process of membrane folding that enables cells to bring “food” into the cell
Pinocytosis
The process of membrane folding that enables cells to bring “water” into the cell
Did we get anything out of doing our lab???….