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Cells and Size

Cells and Size. Do cells have size limits?. One size for all?. Cells can range from 2µm to 200µm (10⁻⁶m ). µm = millionth of a meter or 0.000001m Most eukaryotic cells are about 10µm. Not visible with the naked eye . Let's put this into perspective!!. One size for all?.

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Cells and Size

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  1. Cells and Size Do cells have size limits?

  2. One size for all? • Cells can range from 2µm to 200µm (10⁻⁶m). • µm = millionth of a meter or 0.000001m • Most eukaryotic cells are about 10µm. • Not visible with the naked eye. Let's put this into perspective!!

  3. One size for all? • This means that an infant’s cells are the same size as an adult or teenager. • Eukaryote cells all have similar sizes. • They increase cell numbers to grow. • Why do Eukaryotes have so many cells? Why do we not have just 1 cell or 10 cells? • There is still lots of cell variety!!!

  4. A few Cell types Epithelial Cells (skin) Muscle Cells Nerve Cells

  5. A few Cell types • These cells may look very different, but are all about the same size. • Shapes may change, but sizes are constrained!! Why?? Red and White Blood Cells Plant cells

  6. Ways organisms increase Surface Area • Microvilli in the small intestine • Branches in Lungs • Anemones many tentacles • Trees and their broad/flat leaves

  7. Ways organisms increase Surface Area • Increasing Surface Area for individual cells is also important. • Consider : • What are all these adaptations trying to accomplish for the organism?

  8. Questions to Think About • What measurements represent the cell membrane? The cytoplasm? • Does the distance from the center increase or decrease from model to model? • Which cell is best able to interact with its environment? • How can cells increase their total surface area to volume ratio?

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