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???….