fluid mosaic model
DESCRIPTION
Fluid Mosaic Model. Current model of the membrane structure. Phospholipid fluid sea in embedded with a wide variety of protein molecules. Cell Membrane. The cell membrane is also known as: Phospholipids bi-layer Plasma membrane Fluid mosaic membrane. What is a Solution?. - PowerPoint PPT PresentationTRANSCRIPT
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Fluid Mosaic Model• Current model of the membrane structure.• Phospholipids fluid sea in embedded with a
wide variety of protein molecules.
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Cell Membrane• The cell membrane is also known as:
–Phospholipids bi-layer–Plasma membrane–Fluid mosaic membrane
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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 solute
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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]
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Concentration Gradient
Down
Low
High
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Prot
ein
Carrier moleculeCa
rrie
r
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What can diffuse through?
• Small & nonpolar molecules can diffuse through the cell membrane•CO2
•O2
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Understanding solutions
• More Solvent• Less Solute
• Less solvent• More Solute
solute
solvent
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Understanding solutions
Hypotonic solution Hypertonic Solution
solute
solvent
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Understanding solutions
• Hypotonic Solution • Hypertonic solution
Cell
solvent
solute
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Understanding solutions• The solution has solvent and solute• The cell has solvent and solute too.
solute
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Who has more solute?
What type of solution is this cell in?
25% solute
75% solute
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What will happen to this cell?
H2O
CellShrinks
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Who has more solute?
What type of solution is this cell in?
85% solute
15% solute
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H2OCell
Swells or burst
Lysis
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Who has more solute?
What type of solution is this cell in?
40% solute
40% solute
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Isotonic solution
40% solute
40% solute
60% water
60% water
60% water
60% water
The cell stays the same
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Hypertonic Solution
Plant Cells Animal Cells
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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.
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Osmotic Pressure • The pressure of water moving
across a membranes cause by a concentration gradient.
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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 cells
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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.
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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.
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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.
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Active or Passive Transport• Endocytosis • Diffusion• Exocytosis• Osmosis• Oxygen• Carbon dioxide• Sugar• Water• Pinocytosis• Phagocytosis
Active
Passive
Active
Passive
Passive
Passive
Passive
Passive
Active
Active
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Leaf Anatomy
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