Mechanical tugging force regulates the size of cell cell ...
Cell Boundaries Chapter 7-3. Cell Membrane Regulates what enters and leaves the cell.
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Transcript of Cell Boundaries Chapter 7-3. Cell Membrane Regulates what enters and leaves the cell.
![Page 1: Cell Boundaries Chapter 7-3. Cell Membrane Regulates what enters and leaves the cell.](https://reader036.fdocuments.us/reader036/viewer/2022062518/56649f3d5503460f94c5d64f/html5/thumbnails/1.jpg)
Cell BoundariesChapter 7-3
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Cell Membrane
Regulates what enters and leaves the cell
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Diffusion • Movement of molecules from high to
low concentrations
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![Page 5: Cell Boundaries Chapter 7-3. Cell Membrane Regulates what enters and leaves the cell.](https://reader036.fdocuments.us/reader036/viewer/2022062518/56649f3d5503460f94c5d64f/html5/thumbnails/5.jpg)
Osmosis Movement of H2O from area of HIGH
concentration to LOW across a selectively permeable membrane
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Hypotonic(“below strength”)
• Water will move INTO the cell causing it to swell
• Cells could rupture if cell takes too much water in
• Increases turgor pressure
“Hypo Hippo”
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Hypertonic Solution“above strength”
• Dissolved substances are HIGHER OUTSIDE & LOWER INSIDE the cell
• H2O rushes out of the cell causing it to shrivel
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Isotonic Solution“same strength”
Dissolved substances are the SAME OUTSIDE and are the SAME INSIDE
• Movement inside the cell = movement outside
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PRACTICE TIME
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Facilitated Diffusion• Molecules like glucose can’t just
“diffuse”, they need help by a protein channel.
• DOES NOT REQUIRE ENERGY
• HIGH to LOW
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Facilitated Diffusion• High to Low
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Active Transport• Requires ENERGY!!! (ATP) adenosine tri-
phosphate and protein pumps• Low concentration to High concentration
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Active Transport
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Active Transport
“Going Against the Gradient”
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Phagocytosis“Cell Eating”
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Pinocytosis“cell drinking”
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Exocytosis