cells and size
Post on 30-Dec-2015
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Cells and SizeDo cells have size limits?
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?
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!!!
One size for all?
A few Cell types
Muscle Cells
Epithelial Cells (skin)
Nerve Cells
These cells may look very different, but are all about the same size.
Shapes may change, but sizes are constrained!! Why??
A few Cell types
Red and White Blood Cells
Plant cells
Microvilli in the small intestine
Branches in Lungs
Anemones many tentacles
Trees and their broad/flat leaves
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?
Ways organisms increase Surface Area
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?
Questions to Think About
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