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Section 7-3

Section 7-3. Cell Boundaries. Plasma Membrane or Cell Membrane. The boundary between the cell and its environment. Controls what enters and leaves the cell Helps the cell maintain homeostasis

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Section 7-3

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  1. Section 7-3 Cell Boundaries

  2. Plasma Membrane or Cell Membrane • The boundary between the cell and its environment. • Controls what enters and leaves the cell • Helps the cell maintain homeostasis • Selectively permeable – a process by which the plasma membrane allows some molecules into the cell while keeping others out.

  3. Plasma Membrane • Lipid Bilayer – two layers of lipids.

  4. Plasma Membrane • Fluid Mosaic Model – flexible • Cholesterol is found in the plasma membrane and helps to stabilize the plasma membrane. Prevents the fatty acid chains from sticking together.

  5. Transport Proteins • Allow needed substances or waste materials to move through the plasma membrane. • Regulates which molecules enter and which molecules leave a cell.

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