Cell Membrane - allows materials in or out of the cell Consists of:

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Presentation transcript:

Cell Membrane - allows materials in or out of the cell Consists of: 1) Lipid Bilayer- 2 layers of fat tissue 2) Proteins- embedded into membrane - help move materials across Cell Membranes are: Selectively Permeable- controls what materials are allowed to cross.

CELL MEMBRANE

Cell Membrane Processes Diffusion - movement of materials from high to low concentration - diffusion requires no energy - continues until equilibrium is reached

Osmosis - the diffusion of water * Water moves across when materials can’t

Osmosis Continued: - cells may shrink or burst due to osmosis

* Does not require energy!* Facilitated Diffusion - use of proteins in the membrane that aid diffusion * Does not require energy!*

Active Transport - using energy to move materials across the cell membrane. - used to fight natural diffusion

Cell Transport Vocabulary Review A. Movement of water from high to low concentration B. The use of energy to move particles in/out of a cell C. Organelle that moves materials in/out of a cell D. Process of moving materials from high to low concentration E. Moving particles across a membrane without needing energy F. The use of proteins to move large particles in/out of a cell