cell membrane: structure and function. in or out? 1. what are some things that can pass through a...
TRANSCRIPT
![Page 1: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/1.jpg)
Cell Membrane: Structure and Function
![Page 2: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/2.jpg)
In or Out?
1. What are some things that can pass through a window screen?
2. What are some things that cannot pass through a window screen? Why is it important to keep these things from moving through the screen?
3. The cell is surrounded by a cell membrane, which regulates what enters and leaves the cell. Why is it important to regulate what moves into and out of a cell?
Interest Grabber
![Page 3: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/3.jpg)
Outsideof cell
Insideof cell(cytoplasm)
Cellmembrane
Proteins
Proteinchannel Lipid bilayer
Carbohydratechains
Section 7-3
Figure 7-12 The Structure of the Cell Membrane
![Page 4: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/4.jpg)
Cell Membrane
Function = controls what enters the cell and what leaves the cell
Made of a lipid bilayer Has proteins Has some carbohydrates, which
help with identification Is fluid (fluid mosaic model)
![Page 5: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/5.jpg)
Diffusion
Def. of diffusion = Spreading of molecules in a given space.
What happens? -Substances move from an area
where there is more of them to an area where there is less of them
![Page 6: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/6.jpg)
Diffusion
Def. of permeable = membrane that lets substances pass through it
Cell membrane is selectively permeable, which means that it lets some things in but does not let other things in
Substances keep moving till there is about equal amounts of them on both sides of the membrane
![Page 7: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/7.jpg)
HighConcentration
LowConcentration
CellMembrane
Glucosemolecules
Proteinchannel
Section 7-3
Diffusion
![Page 8: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/8.jpg)
Factors that Affect Diffusion
Amounts of substances involved
Temperature
Pressure
Stirring -speeds up the rate of diffusion
![Page 9: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/9.jpg)
Diffusion
Diffusion Video
![Page 10: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/10.jpg)
Osmosis Def. of osmosis = movement of
water from greater to lesser
![Page 11: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/11.jpg)
Figure 8.11 Osmosis
![Page 12: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/12.jpg)
Figure 8.12 The water balance of living cells
![Page 13: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/13.jpg)
Osmosis
Water goes into a cell causing it to swell up and burst = plasmoptysis
Water leaves the cell causing it to shrink = plasmolysis
*Know the difference between plasmoptysis and plasmolysis!*
![Page 14: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/14.jpg)
Osmosis
Some one-celled organisms have a contractile vacuole that pumps water out of a cell
In plants, as water goes into the cell, it builds up pressure that pushes against cell wall. This is called turgor pressure.
![Page 15: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/15.jpg)
Contractile Vacuole
![Page 16: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/16.jpg)
Osmosis
Osmosis Video
![Page 17: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/17.jpg)
Passive Transport
NO ENERGY NEEDED!
Is the movement of small molecules in and out of a cell
Molecules go from greater to lesser (=with concentration gradient)
Examples: amino acids, fatty acids, glycerol, simple sugars (glucose)
![Page 18: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/18.jpg)
Passive Transport
![Page 19: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/19.jpg)
Passive Transport
Passive Transport Video
![Page 20: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/20.jpg)
Active Transport
ENERGY NEEDED!
Molecules go from lesser to greater (=against concentration gradient)
This is when large molecules are pulled through the cell membrane by the use of ENERGY
Do not fully know how it works
![Page 21: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/21.jpg)
Molecule tobe carried
Moleculebeing carried
Energy
Section 7-3
Figure 7-19 Active Transport
![Page 22: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/22.jpg)
Active Transport
Active Transport Video
![Page 23: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/23.jpg)
Endocytosis and Exocytosis
Def. of endocytosis = process by which cells take in large molecules from the outside
-ex. pinocytosis and phagocytosis
• Def. of exocytosis = process by which cells get rid of large molecules in the cell
![Page 24: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/24.jpg)
Pinocytosis
Pinocytes are pockets on the cell membrane.
Large molecules fall into the pockets and get turned into food vacuoles inside the cell
![Page 25: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/25.jpg)
Pinocytosis
![Page 26: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/26.jpg)
Phagocytosis: Engulfing
This is when large molecules are surrounded and pulled into the cell
Examples: amoeba, white blood cells called phagocytes
This is the same method used by white blood cells to trap bacteria in our blood
![Page 27: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/27.jpg)
Phagocytosis: Engulfing
![Page 28: Cell Membrane: Structure and Function. In or Out? 1. What are some things that can pass through a window screen? 2. What are some things that cannot](https://reader035.vdocuments.net/reader035/viewer/2022062500/5697bfe31a28abf838cb5278/html5/thumbnails/28.jpg)
Endocytosis and Exocytosis Video
Endocytosis and Exocytosis