Current model of the membrane structure Phospholipids fluid sea in embedded with a wide variety of protein molecules Cell Membrane The cell membrane is also known as Phospholipids bilayer Plasma membrane ID: 310867
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Slide1Slide2
Fluid Mosaic Model
Current model of the membrane structure.
Phospholipids fluid sea in embedded with a wide variety of protein molecules.Slide3
Cell Membrane
The cell membrane is also known as:
Phospholipids bi-layer
Plasma membrane
Fluid mosaic membraneSlide4Slide5
What is a Solution?
Is a homogeneous mixture
A combination of a Solute and Solvent.Large part is the solvent
(water)
Small part is the soluteSlide6
What is a [ ] Gradient?
Is
the process of particles, which
the solutes is moving
through a solution
from
an area of
higher
number of particles to an area of
lower
number of particles.
[
High ] to [Low] Slide7
Concentration Gradient
Down
Low
HighSlide8Slide9Slide10
Protein
Carrier molecule
CarrierSlide11Slide12
What can diffuse through?
Small
&
nonpolar
molecules can diffuse through the cell membrane
CO
2
O
2Slide13
Understanding solutions
More Solvent
Less Solute
Less solvent
More Solute
solute
solventSlide14
Understanding solutions
Hypotonic solution
Hypertonic Solution
solute
solventSlide15
Understanding solutions
Hypotonic Solution
Hypertonic solution
Cell
solvent
soluteSlide16
Understanding solutions
The solution has solvent and solute
The cell has solvent and solute too.
soluteSlide17
Who has more solute?
What type of solution is this cell in?
25% solute
7
5% soluteSlide18
What will happen to this cell?
H
2
O
Cell
ShrinksSlide19
Who has more solute?
What type of solution is this cell in?
85% solute
1
5% soluteSlide20
H
2
O
Cell
Swells or burst
LysisSlide21
Who has more solute?
What type of solution is this cell in?
40% solute
40% soluteSlide22
Isotonic solution
40% solute
40% solute
60% water
60% water
60% water
60% water
The cell stays the sameSlide23Slide24Slide25Slide26Slide27Slide28
Hypertonic Solution
Plant Cells
Animal CellsSlide29
Hydrophobic
vs
Hydrophilic
Hydrophilic
(attracted to water)
Hydrophobic
(not attracted to water but are attracted to other hydrophobic tails)
They have a
hydrophilic phosphate
head and two
hydrophobic hydrocarbon tails
.
Cell membranes are made up of a double layer of these
phospholipid
molecules.
The
phospholipid
bilayer
makes the membrane very stable but also allows flexibility.
The
phospholipid
in the membrane are in a
fluid state
which allows the cell to change it’s shape easily. Slide30
Osmotic Pressure
The pressure of water moving across a membranes cause by a concentration gradient.Slide31
Turgor
Pressure
Is a hydrostatic pressure due to a plant cell being placed in a
hypotonic
solution
.
Is pressure on inside of a cell against the cell wall.
Only in plant cellsSlide32
What is
Plasmolysis
?
The Shrinking of cell membrane from cell wall in a plant or bacterial cell, caused by loss of water through osmosis.
from Greek
lusis
, a loosening. Slide33
What is
Crenation
?Crenation
is the contraction of a cell after exposure to a
hypertonic solution
, due to the loss of water through
osmosis
.
Crenation
occurs because in a hypertonic environment,
osmosis .As a result the cell shrinks and forms abnormal
notchings
around its edges.Slide34
What is cytolysis?
Cytolysis
, or
osmotic
lysis
, occurs when a cell bursts due to an
osmotic imbalance
that has caused excess water to move into the cell.
It occurs in a
hypotonic
environment. Where water moves into the cell by
osmosis
where the volume exceeds the membrane's capacity and the cell bursts.
The presence of a
cell wall
prevents the membrane from bursting, so cytolysis only occurs in
animal
and
protozoa
cells which do not have cell walls.Slide35
Active or Passive Transport
Endocytosis
Diffusion
Exocytosis
Osmosis
Oxygen
Carbon dioxide
Sugar
Water
PinocytosisPhagocytosis
Active
Passive
Active
Passive
Passive
Passive
Passive
Passive
Active
ActiveSlide36Slide37Slide38Slide39Slide40Slide41Slide42Slide43Slide44Slide45Slide46
Leaf AnatomySlide47Slide48