3.3 Cell Membrane KEY CONCEPT The cell membrane is a barrier that separates a cell from the external...

3.3 Cell Membrane

KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment.

3.3 Cell Membrane

Cell membranes are composed of two phospholipid layers.

3.3 Cell Membrane

Cell membranes are composed of two phospholipid layers.• The cell membrane has two major functions.

cell membrane

3.3 Cell Membrane

– forms a boundary between inside and outside of the cell

cell membrane outside cell

inside cell

3.3 Cell Membrane

– forms a boundary between inside and outside of the cell

– controls passage of materials

cell membrane outside cell

inside cell

3.3 Cell Membrane

cell membrane

Cell membranes are composed of two phospholipid layers.• The cell membrane is made of a phospholipid bilayer.

3.3 Cell Membrane

cell membrane

Cell membranes are composed of two phospholipid layers.• The cell membrane is made of a phospholipid bilayer.• There are other molecules embedded in the membrane.

protein

cholesterol

proteincarbohydratechain

protein channel

3.3 Cell Membrane

cell membrane

Cell membranes are composed of two phospholipid layers.• The cell membrane is made of a phospholipid bilayer.• There are other molecules embedded in the membrane.• The fluid mosaic model describes the membrane.

protein

cholesterol

proteincarbohydratechain

protein channel

3.3 Cell Membrane

Cell membranes are composed of two phospholipid layers.• The cell membrane is selectively permeable.

Some molecules can cross the membrane while others cannot.

3.3 Cell Membrane

Cell membranes are composed of two phospholipid layers.• The cell membrane is selectively permeable.

Some molecules can cross the membrane while others cannot.

3.3 Cell Membrane

Chemical signals are transmitted across the cell membrane.• Receptors bind with ligands and change shape.• There are two types of receptors.

3.3 Cell Membrane

– intracellular receptor

3.3 Cell Membrane

– intracellular receptor– membrane receptor

3.3 Cell Membrane KEY CONCEPT The cell membrane is a barrier that separates a cell from the external...

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