64
UNIT 1
Organization of the Body
3
Integral
proteins
Extracellular fluid
(watery environment
outside cell)
Cytoplasm
(watery environment
inside cell)
Polar head of
phospholipid
molecule
Glycolipid
Cholesterol
Peripheral
proteins
Lipid bilayer
containing proteins
Inward-facing layer
of phospholipids
Outward-facing layer
of phospholipids
Glycocalyx
(carbohydrates)
Glycoprotein
Nonpolar tail
of phospholipid
molecule
Filament of
cytoskeleton
Figure 3.3
The plasma membrane.
The lipid bilayer forms the basic structure of the membrane.
The associated proteins are involved in membrane functions such as membrane transport, catalysis,
and cell-to-cell recognition.
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