The Plasma Membrane Structure and function. The phospholipid bilayer  2 layers of phospholipid molecules –“head” is hydrophylic –“tail” is hydrophobic.

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Presentation transcript:

The Plasma Membrane Structure and function

The phospholipid bilayer  2 layers of phospholipid molecules –“head” is hydrophylic –“tail” is hydrophobic

Semipermeable!  Semipermeable refers to the fact that the membrane only allows certain particles to pass through.

Diffusion  Particles naturally will spread out to fill a space evenly.

Osmosis  Water will naturally move from hypotonic to hypertonic.  This will continue until isotonicity is reached.

Passive Processes  “Passive” refers to not requiring energy. –Only possible when moving particles in the direction of natural diffusion. (With the Concentration Gradient)

 Proteins imbedded in the membrane form channels allowing larger particles through

Active Transport  Proteins imbedded in the membrane force partices against the concentration gradient

Other functions of the membrane  Glycoproteins serve as identification.  Proteins serve as anchors for the cytoskeleton.  Proteins bind cells to one another

Functions Review

Complete Picture of the Membrane