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The Importance of Cell Division

The Importance of Cell Division. Section 2.1 Pages 36-38 BC Science Probe 9. The Importance of Cell Division. What would you look like if every cut or scratch that you ever had remained?. The Importance of Cell Division.

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The Importance of Cell Division

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  1. The Importance of Cell Division Section 2.1 Pages 36-38 BC Science Probe 9

  2. The Importance of Cell Division • What would you look like if every cut or scratch that you ever had remained?

  3. The Importance of Cell Division • Imagine what you would look like if your skin cells didn’t die and get replaced by new ones. • Throughout your life, your body will use cell division to replace damaged or dead cells. • It will slow as you get older, but it won’t stop completely until you die!

  4. Functions of Cell Division • Growth • All living things are made up of one or more cells. • All living things begin life as one single cell. • Why don’t cells just increase in size to grow?

  5. Functions of Cell Division • Growth • Well, as a cell grows, the volume of the cytoplasm gets too big compared to the surface of the cell membrane for the cell to work properly. • Once a cell gets big enough, it has to divide into two smaller cells that will do the same things.

  6. Functions of Cell Division • Growth • So to increase in size or grow, a multicellular organism has to use cell division. • Once a body has enough cells, they can start to specialize to form tissues and organs.

  7. Functions of Cell Division • Repair • Multicellular organisms also use cell division to repair damaged cells. • You don’t actually go through life will all the same cells that you were born with.

  8. Functions of Cell Division • Repair • Every second, old and dead cells are replaced in your body and in the bodies of other multicellular organisms.

  9. Functions of Cell Division • Reproduction • Unicellular organisms, like a paramecium, are each only made up of one cell. • They need to use cell division to reproduce.

  10. Functions of Cell Division • Reproduction • The new cells will contain the same structures and carry out the same functions as the parent cell. • There are actually even some multicellular organisms that can reproduce by cell division too, like mushrooms.

  11. Functions of Cell Division • Reproduction • There are still lots of questions about how and why cell division works as it does. • Why do some cells reproduce at different rates at different times? • Why can some cells divide while others can’t? • Why do cancer cells divide out of control?

  12. Try This! • From One Cell to Trillions (page 37) • The human body contains trillions of cells. They all came from a single cell. In this activity, you will investigate the number of cells divisions needed to form a human body.

  13. Try This! • Calculate the number of cells after each division on handout 2.1.

  14. Try This! • How does the number of cells that are produced relate to the number of cell divisions that occur? • How many cells would there be after 25 divisions? • How many cell divisions are needed to produce more that a trillion cells?

  15. Assignment • CYU page 38 • #1, 3, 4, 5, 7, 10, 12, 14

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