Diffusion

• What is the main topic covered in today's video?

  Diffusion
• What is diffusion?

  Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration.
• What happens to molecules when they are left alone?

  They move about randomly and spread out over time.
• How does the concept of net movement relate to diffusion?

  Net movement refers to the overall movement of all particles considered together as a group.
• Can diffusion occur in both gases and liquids?

  Yes, diffusion can happen in both gases and liquids.
• What is an example of diffusion in gases?

  Scent of perfume spreading across a room.
• What is an example of diffusion in liquids?

  Food coloring diffusing in a beaker of water.
• What type of membrane allows diffusion of some molecules but not others?

  A partially permeable membrane.
• What types of molecules can generally diffuse through cell membranes?

  Very small molecules like water, glucose, and amino acids.
• Why can't larger molecules diffuse through cell membranes?

  Because they are too big to fit through the membrane.
• Is diffusion an active or passive process?

  Diffusion is a passive process.
• What is the first factor that affects the rate of diffusion?

  The concentration gradient.
• How does a larger concentration gradient affect the rate of diffusion?

  A larger concentration gradient increases the rate of diffusion.
• What is the second factor that affects the rate of diffusion?

  Temperature.
• How does temperature affect the rate of diffusion?

  Higher temperatures give particles more energy, leading to faster diffusion.
• What is the third factor that affects the rate of diffusion?

  Surface area.
• How does a larger surface area affect the rate of diffusion?

  A larger surface area increases the rate of diffusion.
• What are the three factors that affect the rate of diffusion?

  • Concentration gradient
  • Temperature
  • Surface area
• What is the process of diffusion?

  • Random movement of particles
  • Movement from high concentration to low concentration
  • Results in even distribution over time
• What are the characteristics of a partially permeable membrane?

  • Allows some molecules to pass through
  • Generally permits small molecules
  • Blocks larger molecules
• What is the significance of diffusion in biological systems?

  • Essential for nutrient uptake
  • Important for gas exchange
  • Key in waste removal