3.3 cell membrane key concept the cell membrane is a barrier that separates a cell from the external...
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3.3 Cell Membrane
KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment.
![Page 2: 3.3 Cell Membrane KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment](https://reader035.vdocuments.us/reader035/viewer/2022062404/5515a31d550346486b8b5ec9/html5/thumbnails/2.jpg)
3.3 Cell Membrane
Cell membranes are composed of two phospholipid layers.
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3.3 Cell Membrane
Cell membranes are composed of two phospholipid layers.• The cell membrane has two major functions.
cell membrane
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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 outside cell
inside cell
![Page 5: 3.3 Cell Membrane KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment](https://reader035.vdocuments.us/reader035/viewer/2022062404/5515a31d550346486b8b5ec9/html5/thumbnails/5.jpg)
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 outside cell
inside cell
![Page 6: 3.3 Cell Membrane KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment](https://reader035.vdocuments.us/reader035/viewer/2022062404/5515a31d550346486b8b5ec9/html5/thumbnails/6.jpg)
3.3 Cell Membrane
Cell membranes are composed of two phospholipid layers.
![Page 7: 3.3 Cell Membrane KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment](https://reader035.vdocuments.us/reader035/viewer/2022062404/5515a31d550346486b8b5ec9/html5/thumbnails/7.jpg)
3.3 Cell Membrane
cell membrane
Cell membranes are composed of two phospholipid layers.• The cell membrane is made of a phospholipid bilayer.
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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
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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
![Page 10: 3.3 Cell Membrane KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment](https://reader035.vdocuments.us/reader035/viewer/2022062404/5515a31d550346486b8b5ec9/html5/thumbnails/10.jpg)
3.3 Cell Membrane
Cell membranes are composed of two phospholipid layers.
![Page 11: 3.3 Cell Membrane KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment](https://reader035.vdocuments.us/reader035/viewer/2022062404/5515a31d550346486b8b5ec9/html5/thumbnails/11.jpg)
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.
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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.
![Page 13: 3.3 Cell Membrane KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment](https://reader035.vdocuments.us/reader035/viewer/2022062404/5515a31d550346486b8b5ec9/html5/thumbnails/13.jpg)
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.
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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
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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