Cell Transport
Define HOMEOSTASIS.
How does the plasma membrane
maintain homeostasis?
Cell Transport
Define HOMEOSTASIS.
Maintaining a relatively constant or stable
internal environment, even when external
conditions change dramatically
How does the plasma membrane
maintain homeostasis?
Cell membranes help organisms maintain
homeostasis by controlling what substances
may enter or leave cells
Structure of the
Cell Membrane
What type of organic
compound is shown?
Label each of the following:
• Glycerol
• Phosphate
• Saturated Fatty Acid
• Unsaturated Fatty Acid
Structure of the Cell Membrane
Phospholipid molecules
make up the cell membrane.
The head of the phospholipid
is polar
• What is a polar molecule?
• The polar head is
hydrophilic (they can mix
with water).
Structure of the Cell Membrane
The tails of the
phospholipid is nonpolar
• The nonpolar tail is
hydrophobic (they can’t
mix with water).
Phospholipid Bilayer:
the tails face inward to
avoid contact with water,
the heads face outward to
be in contact with water.