rs Video Recap : Diffusion 2. When diffusion has reached equilibrium , we say that the net movement of the molecules is zero. Does this mean these molecules below would stop moving ? Explain using the image below. square square square square square square 6. Sometimes , a substance can only travel across a cell membrane via facilitated diffusion . What is facilitated diffusion?

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rs Video Recap : Diffusion 2. When diffusion has reached equilibrium , we say that the net movement of the molecules is zero. Does this mean these molecules below would stop moving ? Explain using the image below. square square square square square square 6. Sometimes , a substance can only travel across a cell membrane via facilitated diffusion . What is facilitated diffusion?

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2. No, the molecules would not stop moving when diffusion has reached equilibrium. They continue to move randomly but there is no net movement from one area to another. 6. Facilitated diffusion is a type of passive transport that allows substances to cross the cell membrane with the help of carrier proteins. This process is used when substances cannot diffuse through the cell membrane unaided, often because they are too large or too polar.

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## Step1: Understanding the concept of diffusion and equilibrium is crucial to answer the first part of the question. Diffusion is the process where particles move from an area of higher concentration to an area of lower concentration. When the concentration of these particles becomes equal in two regions, we say that equilibrium has been reached. However, reaching equilibrium does not mean that the particles stop moving. They continue to move, but the movement is random and there is no net movement from one area to another. ## Step2: The image provided in the question is not visible, but typically in such images, we would see molecules evenly distributed, indicating that equilibrium has been reached. Despite this even distribution, the molecules would still be in motion, albeit with no net movement from one area to another. This is because the molecules are in constant kinetic motion, and this motion does not cease when equilibrium is reached. ## Step3: Facilitated diffusion is a type of passive transport that allows substances to cross the cell membrane with the help of carrier proteins. This process is used when substances cannot diffuse through the cell membrane unaided, often because they are too large or too polar. In facilitated diffusion, these substances still move down their concentration gradient, but do so with the help of specific proteins within the cell membrane. ### The formula for facilitated diffusion is: **\( \text{Rate of facilitated diffusion} = \frac{\text{Number of carrier proteins} \times \text{Turnover number}}{\text{Membrane thickness}} \)**

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