2.D) Movement of substances into and out of cells

2.D) Movement of substances into and out of cells

1. 3. Active Transport

   • goes against concentration gradient
     • protien carriers in cell membrane

2. Higher/lower concentration gradient

   • 1. Diffusion
     • cell membrane permeable to a substance
       • example oxygen and carbon dioxide
         • experiment: ink moving throughout water
   • 2. Osmosis
     • diffusion with water molecules
       • diluted molecules have more kinetic energy to move
         • experiment: pure water against salty water carrots

3. turgid cells

   • cells full of water
     • supports plants

4. Factors affecting movment

   • 1. surface area : volume
     • flatter means more transport
   • 2. temperature
     • changes rate of movement
   • 3. concentration gradient
     • higer to lower