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Plasma membrane

It is also called a cell membrane, cytoplasmic membrane or plasmalema. The whole cell, whether prokaryote or eukaryote, has a membrane that isolates from the outside: the plasma membrane. This membrane is so thin (between 6 and 9 nm) that the finest optical microscopes could not make it visible.
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3.1: Case Study - The Importance of Cells - Biology

Case Study: More Than Just TiredWe all get tired sometimes, especially if we have been doing a lot of physical activity. But for Jasmin, a 34-year-old former high school track star who is now a recreational runner, her tiredness was going far beyond what she thought should be normal for someone who is generally in good physical shape.
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