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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 Cell membranes are composed of two phospholipid layers. • The cell membrane has two major functions. – forms a boundary between inside and outside of the cell cell membrane inside cell outside cell 3.3 Cell Membrane Cell membranes are composed of two phospholipid layers. • The cell membrane has two major functions. – forms a boundary between inside and outside of the cell – controls passage of materials cell membrane inside cell outside cell 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 is made of a phospholipid bilayer. cell membrane 3.3 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. cell membrane carbohydrate chain cholesterol protein protein channel protein 3.3 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. cell membrane carbohydrate chain cholesterol protein protein channel protein 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 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 Chemical signals are transmitted across the cell membrane. • Receptors bind with ligands and change shape. • There are two types of receptors. – intracellular receptor 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. – intracellular receptor – membrane receptor
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