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The plasma membrane. Maintaining control of the internal environment. You will learn. The structure of the plasma membrane How the plasma membrane functions as a semi-permeable membrane. Vocabulary. Homeostasis Selectively Permeable Fatty acid tail Hydrophilic Hydrophobic

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the plasma membrane

The plasma membrane

Maintaining control of the internal environment

you will learn
You will learn
  • The structure of the plasma membrane
  • How the plasma membrane functions as a semi-permeable membrane
vocabulary
Vocabulary
  • Homeostasis
  • Selectively Permeable
  • Fatty acid tail
  • Hydrophilic
  • Hydrophobic
  • Phospholipid bilayer
  • Fluid mosaic model
slide4
What does a cell membrane need to do?
  • Bring nutrients in
  • Let waste out
  • Allow ions to move back and forth
  • Maintain homeostasis
function of plasma membrane
Function of plasma membrane
  • Cell membrane acts as a gatekeeper.
  • It has selective permeability

Water freely enters and leaves the cell

Other particles, such as ions, are controlled:

    • certain times
    • certain amounts
    • certain places
structure of plasma membrane
Structure of plasma membrane
  • Made of lipids (fats) with a phosphate head
  • Lipid portion is 2 fatty acid tails. The tail is hydrophobic: does NOT like water
  • Phosphate head is hydrophilic: it DOES like water.

phospholipid

slide7
Polar means an unequal sharing of electrons- polar molecules are water soluble- they are hydrophylic
  • Non-polar means equal sharing. These molecules are hydrophobic
slide9
In water, phospholipids spontaneously form a stable two layer sheet called a phospholipid bi-layer
slide11
Cholesterol embedded in membrane keeps it fluid
  • The bi-layer is known as the Fluid MosaicModel, because proteins embedded in the membrane can move
slide12
Some proteins span membrane and determine which molecules can enter or leave. These are transport proteins.
  • Other proteins on the surface act as receptors