1.3.1 Diffusion

• The Principle of Diffusion states that particles move from low to high concentration.

  False
• Match the transport mechanism with its definition:

  Diffusion ↔️ Movement from high to low concentration

  Osmosis ↔️ Movement of water molecules

  Active Transport ↔️ Movement against concentration gradient
• What happens to the rate of diffusion when the temperature increases?

  Increases
• Facilitated diffusion can transport substances that cannot cross the membrane by simple diffusion.


  True
• What is the key difference between simple and facilitated diffusion?

  Use of transport proteins
• Diffusion requires external energy input to move particles from high to low concentration.

  False
• Match the transport mechanism with its definition:

  Diffusion ↔️ Movement of particles from high to low concentration due to random motion

  Osmosis ↔️ Movement of water molecules from low to high solute concentration

  Active Transport ↔️ Movement of particles against their concentration gradient using energy
• What is one factor that increases the rate of diffusion?

  Higher temperature
• What happens to the rate of facilitated diffusion once all transport proteins are engaged?

  It plateaus
• Which gas diffuses from the bloodstream into the lungs to be exhaled?

  Carbon dioxide
• What is one advantage of diffusion as a transport mechanism in cells?

  No energy required
• What is the movement of water molecules called from low to high solute concentration?

  Osmosis
• Diffusion is a transport mechanism that does not require any external energy
• The greater the difference in concentration between two areas, the faster the rate of diffusion
• Facilitated diffusion requires specialized proteins to transport particles across the membrane.
• Facilitated diffusion requires specialized carrier proteins to transport particles across the membrane.


  True
• What type of diffusion utilizes specialized transport proteins embedded in the cell membrane?

  Facilitated diffusion
• The Principle of Diffusion states that particles move from an area of high concentration to an area of low concentration due to their random motion
• Facilitated diffusion requires transport proteins, whereas simple diffusion does not.


  True
• Oxygen diffuses across cell membranes during respiration to enter the bloodstream.

  True
• Smaller particles diffuse faster than larger particles due to their lower mass and easier movement.


  True
• Diffusion is a transport mechanism where particles move from an area of high concentration to an area of low concentration.
• Arrange the following transport mechanisms by their energy requirements:

  1️⃣ Diffusion (no energy required)

  2️⃣ Osmosis (no energy required)

  3️⃣ Active Transport (energy required)
• Particles move from high to low concentration due to random motion in diffusion.


  True
• Match the type of diffusion with its characteristic:

  Simple Diffusion ↔️ No carrier proteins required

  Facilitated Diffusion ↔️ Carrier proteins required
• Simple diffusion involves the movement of particles down their concentration gradient without the need for any carrier proteins
• In simple diffusion, particles move down their concentration gradient without any carrier proteins
• What is the primary driving force behind diffusion?

  Random motion of particles
• Order the factors affecting diffusion rate from most to least effect:

  1️⃣ Concentration Gradient

  2️⃣ Temperature

  3️⃣ Particle Size

  4️⃣ Permeability of the Medium
• An example of facilitated diffusion is the uptake of glucose into red blood cells
• Oxygen diffuses from the air into the bloodstream, while carbon dioxide diffuses from the bloodstream into the lungs