*GPS: S7L2 Students will describe the structure and function of cells, tissues, organs, and organ systems.

a.Explain that cells take in nutrients in order to grow and divide to make needed materials.

b.Relate cell structures (cell membrane, nucleus, cytoplasm, chloroplast, and mitochondria) to basic cell functions

*Explain that cells are organized into tissues, tissues into

organs, organs into systems, and systems into organisms

*selectively permeable- some substances can pass through the membrane while others cannot

*diffusion- the process by which molecules move from an area of higher concentration to an area of low concentration

*osmosis- the diffusion of water molecules through a selectively permeable membrane

*passive transport- the movement of dissolved materials through a cell membrane without using cellular energy

*active transport- the movement of materials through a cell membrane using cellular energy

*endocytosis- the process in which a cell membrane surrounds a particle and encloses it in a vesicle to bring it into the cell

*exocytosis- the process used to remove large particles from a cell

selectively permeable- some substances can pass through the membrane while others cannot

diffusion- the process by which molecules move from an area of higher concentration to an area of low concentration

osmosis- the diffusion of water molecules through a selectively permeable membrane

passive transport- the movement of dissolved materials through a cell membrane without using cellular energy

active transport- the movement of materials through a cell membrane using cellular energy

endocytosis- the process in which a cell membrane surrounds a particle and encloses it in a vesicle to bring it into the cell

exocytosis- the process used to remove large particles from a cell

•Diffusion is the process by which molecules move from an area of high concentration to low concentration.

•Diffusion is the main method that molecules move across the cell membrane.

•Diffusion is caused because molecules are always moving.

•Molecules are bump into each other and cause them to spread.

•Osmosis is the diffusion of water molecules through a selectively permeable membrane.

•Because cells cannot function properly without water, many cellular processes depend on osmosis.

•Osmosis moves water molecules by the process of diffusion.

•Osmosis keeps cells with their shape.

• Passive transport does NOT require using cellular energy to move material through a cellular membrane.

• Active transport requires the cell to use its own energy while moving through the cellular membrane.

• In active transport proteins get “picked up” outside the cell and carried inside the cell.

• When cell remove large particle from inside the outside the cell this is called exocytosis.

• Another method of active transport is engulfing. This is also known as endocytosis because it happens inside the cell.

• During engulfing the cell membrane surrounds a particle and forms a vacuole within the cell.