Selective Permeability

The cell membrane is the area between the cell and its environment. It allows nutrients like glucose, amino acids, and lipids into the cell, while it allows waste and other things out of the cell. It helps keeps the cell's homeostasis, while water freely moves in and out of the cell.

The structure of the cell membrane is a phosphate bilayer, which are two layers of phospholipids. Phospholipids are made up of a glucose backbone, two fatty acid chains, and a phosphate head. With the phosphate bilaryer the phosphate heads stick out of the cell while the two fatty acids are inside. This is because the heads are hydrophilic which means they love water, while the fatty acids are hydrophobic which means they hate water. The plasma membrane is not only made up of the phosphates, it also has cholesterol molecules which stabilizes the membrane and protein transport which allows certain things in and out of the cell.

There are two different kinds of cell transport. One is passive transport which uses no energy; an example of one is facilitated diffusion which is the ones in the cell. Then there is active transport, which uses energy allows ions into the cell which has a high concentration then where it was being pushed from. An example of active transport is endocytosis.

The diffusion of water across a selectively permeable membrane is called osmosis. They balance both side of the membrane, such as an isotonic solution which has the same solution. Then there is hypotonic solution that is when there is more water inside the cell then outside the cell. Then finally there is hypertonic solution which there is more water outside the cell then inside which causes it to wrinkle.

NOTE: This also includes cell Membrane located in another video.

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• Permeability
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[JustinSkottPoole]

soo...the girl you let in is kinda cute ;)

[chanique12]

hhahaha lol, just what i needed for my biology quiz next tuesday:D

[hedonism13]

haha cute

[Shorty20122012]

She better go find a channel in the back of the building or something LOL

[coolboy4965]

racist... lolz jks

[apehLUBEDapo]

wow, it makes so much sense

[escucha1797]

lolz

[1robyn5]

What's so difficult about selective permeability? It would be extremely helpful if you somehow managed to post a video explaining how to tell if an amino acid side chain is polar, non-polar, acidic or basic.. :D

[damalierachel88]

lol..am gonna use this to explain permeability for my video in the biology class.

[airamivaj]

thats gay..but ok

[chloemench]

Very well thought through :P