cells can vary greatly in their size and shape. but they are all still very small. just how big...
TRANSCRIPT
![Page 1: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/1.jpg)
Looking at Cells
Cells can vary greatly in their size and shape.
But they are all still very small.
Just how big are cells?
Cell size is limited for a reason.
http://learn.genetics.utah.edu/content/begin/cells/scale/
http://htwins.net/scale2/
![Page 2: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/2.jpg)
Fig. 4-2a, p. 54
This is the business end of a needle.This one’s infested with E. coli.
200µm = 0.2mm
Bacteria
Finger width= 16mm
![Page 3: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/3.jpg)
Fig. 4-2b, p. 54
40µm = 0.04mm
![Page 4: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/4.jpg)
Fig. 4-2c, p. 54
1µm = 0.001mm
![Page 5: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/5.jpg)
WHY ARE CELLS SO SMALL?
![Page 6: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/6.jpg)
Why Are Cells So Small?
Before we get into the process of one cell becoming 2, you need to know why cells stay small.
Fact: Cells stay small because they are more efficient at taking in the stuff they need and removing the stuff they don’t if they’re small.WHY ARE THEY
SO SMALL???
![Page 7: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/7.jpg)
Think of a Cell as a Protein Factory
Amino
acids,
sugars,
lipids
PROTEINS
WASTE
![Page 8: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/8.jpg)
Looking at Cells• Cells are spectacular machines.• They are both individual power factories
and collective cogs, working together to perform magnificent functions.
• In order to work properly, they must have fuel, such as sugar, and other materials and must be able to remove waste.
• The entrance of needed materials and removal of unwanted waste must be & is regulated.
• The efficiency of this regulation is helped out by the cell being so small.
![Page 9: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/9.jpg)
Looking at Cells• All substances that enter or leave a cell must
cross the surface of the cell.• When a substance is in the cell, the work done
on it happens in the volume of the cell’s interior.
• So there is a relationship between the amount of surface area of the cell and the amount of volume it has.
• This is called surface-area-to-volume ratio.• Cells with higher surface area-to-volume ratios
can exchange substances more efficiently and effectively meaning that they perform their jobs better.
![Page 10: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/10.jpg)
Relationship between Surface Area and Volume
Cell Surface Area to Volume Animation
![Page 11: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/11.jpg)
![Page 12: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/12.jpg)
![Page 13: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/13.jpg)
![Page 14: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/14.jpg)
![Page 15: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/15.jpg)
![Page 16: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/16.jpg)
![Page 17: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/17.jpg)
![Page 18: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/18.jpg)
Looking at Cells When comparing cells of the same shape, small cells
have greater surface area-to-volume ratios than large cells.
So, why are cells so small?
Small cells function more efficiently than large cells. Think of it like this: For every unit of surface area, one door exists = one
thing can move in or out. For every unit of volume, one machine exists = one
protein or waste can be created. When a cell gets too large, it quickly becomes too
crowded with stuff on the inside and doesn’t have enough surface area to move the stuff out.
The factory gets backed up without enough doors!
![Page 19: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/19.jpg)
Relationship between Surface Area and Volume
Cell Surface Area to Volume Animation
How does the door to machine ratio compare. What’s the problem as the cell becomes larger?
![Page 20: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/20.jpg)
![Page 21: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/21.jpg)
![Page 22: Cells can vary greatly in their size and shape. But they are all still very small. Just how big are cells? Cell size is limited for a reason](https://reader035.vdocuments.net/reader035/viewer/2022070308/551c3a7d550346ea388b490d/html5/thumbnails/22.jpg)
Comparing Cell Sizes
In groups: Complete the packet. Check in at the end.
For homework: Complete the “Extension Questions” worksheet you picked up.