Diffusion osmosis and active transport

• diffusion is the movement of particles in a gas or liquid from an area of high concentration to a low concentration
• the factors affecting diffusion

  • temperature- a higher temp makes diffusion happen at a faster rate because the particles will have more energy so they will move around faster
  • surface area-the larger the surface area, the faster diffusion would be
  • concentration gradient-the bigger concentration the faster the diffusion
• diffusion across a cell membrane

  • dissolved substance can move in and out of cells by diffusion
  • small molecules can diffuse through membrane(ex/ oxygen and glucose)
  • large molecules can fit through the membrane(ex/ starch and proteins)
• osmosis is the diffusion of water molecules from an area of high concentration to an area of low concentration across a partially permeable membrane.
• partially permeable membrane- only allows water molecules through but not larger molecules as it has tiny holes
• turgidity is when a cell is full of water, plants become turgid because it has been watered this is good because it helps the plant stay upright and stay alive
• Flaccidity/plasmolysis is when a cell lacks water, plant cells do this because there isn't enough water to push against the cell membrane
• active transport is an active process this means substances will move up a concentration gradient
• energy is required to carry out active transport so it uses mitochondria
• diffusion is a passive process so it does not require energy
• osmosis is a passive process so id=t does not require energy
• active moves substances from a high concentration to a low concentration