Biology_Class_Notes_Section_8.3.doc.

to function for the components of plant and animal cells. o Explain the role of cell membrane as a highly selective barrier (Passive and Active Transport). Think About It When thinking about how cells move materials in and out, it can be helpful to think of a cell as a nation. The boundaries of a nation are its borders, and nearly every country tries to regulate and control the goods the move across those borders. Cells have their own borders, which separate the cell from its surroundings and also determine what comes in and what goes out. How can a cell separate itself from its environment and still allow material to enter and leave? Questions/Main Ideas: Notes: & Key Terms In My Own Words (“How will I remember each term?”) Include Images and Hyperlinks Key Questions What is passive transport? Materials moving through the cell membrane without energy. What is active transport? The movement of materials from one cell membrane to another.