Cell membrane

• Cell surface membrane function

  • Act as a barrier between the cell and its environment: controls what substances enter or leave cell
  • Partially permeable: let some molecules through
  • Substances can move across the cell surface membrane by diffusion and osmosis or active transport.
  • Sometimes called the plasma membrane
• membranes within cells function

  • divide the cell into different compartments, act as a barrier between organelle and cytoplasm.
  • Partially permeable: control what substances enter and leave organelle.
• Whats the function of channel proteins and carrier proteins?

  Allow large molecules and ions to pass through the membrane
• Whats the function of Receptor proteins?

  allows cell to detect chemicals released from other cells, the chemicals signal to the cell to respond a certain way.
• What’s cholesterols function?

  • Gives the membrane stability,
  • binds to hydrophobic tail of phospholipids making membrane less fluid and rigid. Helps to maintain the shape of animal cells. Has hydrophobic regions, its able to create a further barrier to polar substances