Download Cell Transport

Cell/Plasma Membrane
 Regulates what enters and leaves the
cell and provides protection and
support.
 Phospholipid Bilayer
 Selectively Permeable
Cell/Plasma Membrane
 FIRST color the phospholipid bilayer!
 Blue
– phosphate heads
 Red – lipid tails
 Purple - protein
I. Passive Transport –
when the cell does
not require energy to
move molecules
across a membrane.
 Movement from high to
low concentration
(conc.)
Diffusion
Definition
Particle movement from an
area of high concentration
to an area of low
concentration.
Vocabulary
Equilibrium – when the
concentration of the solute
is the same throughout a
system.
Hot Water
Cold Water
Room Temp.
Water
• How does temperature affect diffusion?
• Why is a warm body advantageous to a living thing?
Diffusion
Picture
Examples
Osmosis
Definition
Vocabulary
The diffusion of water
through a selectively
permeable membrane.
• Isotonic – The concentration of
solutes is the same inside and outside
the cell
• Hypotonic – solution has a lower
solute concentration than the cell.
• Hypertonic – solution has a higher
concentration of solute than the cell
Osmosis
Picture
Examples
• Fill this in after GummyBear
Lab!
Facilitated Diffusion
Definition
Movement of specific molecules
across cell membranes through
protein channels
Vocabulary
Protein channel – act as
“doorways” for larger molecules,
and allow certain molecules to
cross membrane
Facilitated Diffusion
Picture
Examples
• Red blood cells have a cell
membrane protein that allows
glucose to pass through it.
• Does not need energy!
2. Active Transport –
energy-requiring
process that moves
material across a
cell membrane
against a
concentration
difference.
Molecular Transport
Definition
When small molecules and ions
are carried across membranes by
proteins in the membrane that
act like energy-requiring pumps
Vocabulary
Needs ENERGY! Moves
from low concentration
to high concentration
Molecular Transport
Picture
Examples
• Many cells move calcium,
potassium, and sodium
across cell membranes
Endocytosis
Definition
• Process of taking material
into the cell by means of
infoldings, or pockets, of the
cell membrane
Vocabulary
•
•
Phagocytosis – “cell eating” extensions
of cytoplasm surround and engulf large
particles and take them into the cell
Pinocytosis – cell takes in liquid from
the surrounding environment
Endocytosis
Picture
• See previous slide.
Examples
• Amoeba’s use endocytosis to get
their food
Exocytosis
Definition
• Process by which a
cell releases large
amounts of material
Vocabulary
• None
Exocytosis
Picture
Examples
• Cell can get rid of
waste or cellular
materials this way
1.
2.
3.
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5.
6.
A cell membrane encloses and takes in a drop of fluid.
Carrier proteins use energy and act as a pump to move
nutrients into a root cell.
Carrier proteins take sugar (glucose) into a cell without
requiring energy input.
Water diffuses across a cell membrane from a region of
high concentration to a region of low concentration.
Mucus and waste products packaged by Golgi
apparatus are secreted by a cell.
A cell membrane encloses and takes in large food
particles.
Passive or active?
Passive or active?
Passive or active?
Food
particle
Amoeba
Passive or active?
Passive or active?
Passive or active?
1.
2.
3.
4.
5.
6.
7.
Obtain a piece of red onion, slide and cover slip.
Create a wet mount slide with water.
Observe the appearance of the cells under the
microscope.
Use toweling method to add several drops of salt
water.
Observe the appearance of the cells under the
microscope.
What happened?
Why?
Before Salt
Water
After Salt
Water