Transcript File - Mrs. Burchette`s Class

Passive and Active Transport
Types of Cellular Transport
•Animations of Active
Transport & Passive
Transport
•
Weee
e!!!
Passive Transport
cell doesn’t use energy
1. Diffusion
2. Facilitated Diffusion
3. Osmosis
•
high
low
Active Transport
cell does use energy
1. Protein Pumps
2. Endocytosis
3. Exocytosis
This is
gonna
be
hard
work!!
high
low
Biological Exchanges:
Diffusion and Osmosis
• Diffusion: net movement of molecules
from an area of high concentration to an
area of low concentration.
• Example: Sugar or salt dissolving in
water. Think Koolaide, instant coffee or
tea, Crystal Lite
• Molecules are
always in
motion
• Difference
between gas,
liquid and solid
Diffusion
• Molecules in solution tend to slowly spread apart
over time. This is diffusion.
T1
T2
T3
Diffusion
concentrated, high energy molecules
[High]
[Low]
diffuse, low energy molecules
Concentration gradient
Diffusion in the Body
• Occurs across cell membranes
• The cell membrane is differentially
permeable (selective)
• Movement of water across the
membrane is called osmosis
Movement of Molecules
Across the Cell Membrane
• Oxygen and
CO2
• Water (Osmosis)
• Ions
(Electrolytes)
• Sugar
Osmosis
• Osmosis is the movement of WATER across
a semi-permeable membrane
• At first the concentration of solute is very high
on the left.
• But over time, the water moves across the
semi-permeable membrane, and dilutes the
particles.
• Video
Animal Cells and
Osmosis
Plant Cells and Osmosis
Vacuole fills
This requires math…
OSMOSIS PRACTICE
Facilitated Diffusion
• Molecules that are too large need a
specific channel to pass through the
membrane
• High to low
Passive Transport
• No energy
• High to low
• Ends in equilibrium
Active Transport
• Using ATP
• Moving against the concentration
gradient (moving uphill)
• Low to high
Types of Active Transport
1. Protein Pumps transport proteins that
require energy to do
work
•Example: Sodium /
Potassium Pumps
are important in nerve
responses.
Sodium
Potassium Pumps
(Active Transport
using proteins)
Protein changes
shape to move
molecules: this
requires energy!
Types of Active Transport
• 2. Endocytosis: taking
bulky material into a cell
• Uses energy
• Cell membrane in-folds
around food particle
• “cell eating”
• 3. Exocytosis expelling
bulky material out of a cell
– “spitting out”
– Vesicle fuses with
membrane, contents exit
Act It Out
• Your group of 4 will find a way to act out
one of these types of active transport.
• Make sure you are showing the main
components of the transport that you
choose.
• Record your skit and email it to me