Download Passive - VA Biology SOL

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 Permeable
If 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
Types of Transport
Passive
(no energy)
Active
(requires energy)
Passive Transport
Passive
Diffusion
Osmosis
Facilitated
Diffusion
Passive Transport
Passive Transport
Movement of materials
that DOES NOT require
energy (ATP)
What is happening here???
DIFFUSION
The passive movement of
material from an area of
high concentration to an
area of low concentration
Concentration
The number of a
substance in a specific
area
High
Concentration
Low
Concentration
High Concentration
Low Concentration
Factors Affecting Diffusion
 Concentration—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
Passive Transport
Passive
Diffusion
Osmosis
Facilitated
Diffusion
OSMOSIS
The diffusion of water
through a selectively
permeable membrane
Facilitated
Diffusion
Diffusion 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 Solution
No 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





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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)
Passive Transport
Passive
Diffusion
Osmosis
Facilitated
Diffusion
Passive Transport
You Should now
have notes for all
of these. Look at
the Organization
of Passive
Transport
Osmosis
Passive
Diffusion
Facilitated
Diffusion
Active Transport
Requires Energy
Active
Pumps
Sodium Potassium Pump
Membrane
Movements
Endocytosis
Exocytosis
Active Transport
Requires Energy
Active Transport
Movement of materials from
low concentration to high
concentration using a protein
carrier that requires energy
(costs ATP)
High 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???….