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Plasma Membrane. Function Allows nutrients to pass into and out of the cell. Allows nutrients to pass into and out of the cell. Maintains homeostasis.

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Presentation on theme: "Plasma Membrane. Function Allows nutrients to pass into and out of the cell. Allows nutrients to pass into and out of the cell. Maintains homeostasis."— Presentation transcript:

1 Plasma Membrane

2 Function Allows nutrients to pass into and out of the cell. Allows nutrients to pass into and out of the cell. Maintains homeostasis. Maintains homeostasis.

3 Structure Composed of a phospholipid bilayer called the fluid mosaic model. Composed of a phospholipid bilayer called the fluid mosaic model.

4 Structure Structure of phospholipid bilayer: Structure of phospholipid bilayer: Each phospholipid contains a glycerol backbone, 2 fatty acid chains, and a phosphate group. Each phospholipid contains a glycerol backbone, 2 fatty acid chains, and a phosphate group. A phosphate is formed by replacing one fatty acid in a lipid with a phosphate group. A phosphate is formed by replacing one fatty acid in a lipid with a phosphate group.

5 Structure Structure of phospholipid bilayer: Structure of phospholipid bilayer: Each phosphate group has two fatty acid tails that are nonpolar and one head containing a polar phosphate group. Each phosphate group has two fatty acid tails that are nonpolar and one head containing a polar phosphate group. The nonpolar tails stop water-soluble molecules form moving through the membrane. The nonpolar tails stop water-soluble molecules form moving through the membrane. The polar head interacts with the watery environment inside and outside the cell. The polar head interacts with the watery environment inside and outside the cell.

6 Structure The phospholipid bilayer also contains: The phospholipid bilayer also contains: Cholesterol Cholesterol Transport Proteins Transport Proteins Proteins Proteins Carbohydrates Carbohydrates

7 Structure Function of cholesterol: Function of cholesterol: Stabilizes the membrane by preventing the fatty acid tails from sticking together. Stabilizes the membrane by preventing the fatty acid tails from sticking together. Function of transport proteins: Function of transport proteins: Span the entire membrane to move substances through the plasma membrane. Span the entire membrane to move substances through the plasma membrane.

8 Structure Function of carbohydrates: Function of carbohydrates: Stick out of the surface of the cell along with proteins in order to identify chemical signals. Stick out of the surface of the cell along with proteins in order to identify chemical signals. Function of proteins at inner surface: Function of proteins at inner surface: Attach the plasma membrane to the internal support structure of the cell. Attach the plasma membrane to the internal support structure of the cell. Give flexibility. Give flexibility.


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