Plasma membrane notes (simple)
Transcript of Plasma membrane notes (simple)
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Plasma (Cell) Membrane
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The plasma membrane provides a barrier
between the internal components of a cell
and its external environment.
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Homeostasis
• The plasma membrane is the key to maintaining an equilibrium between internal and external conditions.
• Homeostasis is necessary to create conditions suitable for life.
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A type of lipids called phospholipids
compose the primary components of the
cell membrane
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The phospholipids in the plasma
membrane have a glycerol backbone,
two fatty acid chains, and a phosphate.
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The two fatty acid tails of the
phospholipids are nonpolar, the head of
the phosphate is polar.
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Water on the outside of the membrane is polar, which attracts the head
of the phosphate turning the tails inside
toward each other forming a bilayer.
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Bilayer Structure
• Composed of a double layer (bilayer) of phospholipids
• Phospholipid is made up of hydrophilic and hydrophobic ends
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The plasma membrane is
water insoluble in the middle. (no
Water)
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Phospholipid bilayerPhospholipid bilayer
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The plasma membrane is a bilayer of
phospholipids with proteins on the surface. The scattered proteins form a mosaic pattern.
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The membrane is fluid because the
molecules can float side to side within the membrane.
Interactive Educational Animations
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10. Cholesterol is found in the plasma membranes (highest in animal cells). It is a steroid. The human body produces 85% of the cholesterol its cells need.
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Cholesterol
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Cholesterol helps stabilize phospholipids because it prevents the chains of the fatty acid
in the phospholipids from sticking together.
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Selectively Permeable
•The property of the membrane that allows some materials to pass through while keeping others out.