Download Chapter 5 Lesson 1 and 2 PPt

Chapter 5
A Journey into the Eukaryotic Cell
Mrs. Park
December 2015
Lesson 1 and 2:
Cell Membrane and Transportation
• Objectives:
1. Explain the bilayer structure of cellular
membranes.
2. Identify the function of other molecules
found in the cellular membrane.
3. Describe a cell’s inside environment.
Lesson 1 Vocabulary
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Bilayer
Plasma membrane
Fluid mosaic model
Transport protein
Extracellar matrix
Cytoplasm
Cytosol
Cell Membrane Structure
• Membranes are made of
phospholipids.
• A lipid molecule with a
head and a tail.
• The head is polar (has a
charge) and water
hydrophilic (water-loving)
• Tail has no charge and is
hydrophobic (waterhating).
The Membrane
• Bilayer
• Two layers
• Heads on the outside,
so they can touch
water-based solutions.
• Tails on the inside,
prevent water from
passing through.
Membrane Location
• Surrounds the cell of
animals and humans.
• Surrounds organelles,
specialized structures in
cells (nucleus,
mitochondria, and
others)
Cell Membrane Function
• Hydrophilic outside lets
the membrane and
organelles interact with
water-based solutions.
• Hydrophobic inside
limits what can enter or
exit the cell.
• Cell membrane is also
called the plasma
membrane
Selectively Permeable Membrane
• The membrane blocks
some molecules
because of their size or
shape.
Transport Helpers
• Proteins in the
membrane often help
move molecules
through the membrane.
• Proteins in the
membrane that help
move molecules across
are transport proteins.
Extracellular Matrix
• Animal cells have a
sticky coating on the
outside of the cell.
• Has fibers in it that help
hold the cells together.
• Allows molecules to
pass from one cell to
another.
Inside the Plasma Membrane
• Inside cells is
cytoplasm, a jelly-like
fluid.
• Cytoplasm is made up
of cytosol.
Chapter 5 Lesson 2
In and out of the Cell
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In and out of the cell:
Passive Transport
Facillitated diffusion
Active transport