C.2.2 - cell membrane

• Phospholipid bilayer

  • Hydrophilic head group - water loving, dissolves easily
  • Hydrophobic tail group - water fearing, doesn’t dissolve easily, hides on inside to shield from water 
• Glycoproteins - transport mechanism for cell, act as hormones
• Cell membrane functions

  • Maintain equilibrium
  • Facilitates materials passing through cell
  • Protect cell from invaders
  • Hold cell together
  • Communicate with other cells
• • Fluid mosaic model - all parts of the cell membrane (although still looking) are always moving
• Semi-permeable - some materials can cross, others can’t
• Particle model of matter

  • All things are made up of particles
  • Particles are always moving
  • There are spaces between particles
  • Particles are attracted to each other