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Kyumin Lee

January 5, 2017

Cell Membrane



Cell Membrane is dynamic and intricate structure that regulates materials transported
o Semi-permeable and selectively permeable (can choose what materials go in cell)



Phospholipids
o Phosphate charged head (Hydrophilic)
o Hydrocarbon Tail (Hydrophobic)
o Layers itself in a bilayer

o Saturated vs Unsaturated


More unsaturated fatty acids result in

increased distance between lipids making the layer more fluid
...
e
...
e
...

o Cell to cell recognition
o Intercellular joining
o Attachment to the cytoskeleton and ECM (ECM only in animal cells)

Kyumin Lee


January 5, 2017

Mechanism
o Passive Diffusion


Through Brownien Motion, the

molecules diffuse from [high] to

requires no ATP
o Falitated Diffusion


Diffusion with the help of channel protein, no ATP is used

[low]

Kyumin Lee

January 5, 2017

o Active Transport


Molecules are moving against a concentration gradient (low to high) or

from low free energy to high free energy using a transport protein and

ATP


I
...
Soduim-Potassium Pump



Electrogenic Pump

o Osmosis


Diffusion of water

Kyumin Lee

January 5, 2017

o Endoctosis


Movement of larger particles into the cell by use of vesicles


3 types

1
...
Pinocytosis


“Cell drinking”- Dissolved molecules are brought

into the cell by engulfing them into a cell membrane

vesicle

3

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