Podcast
Questions and Answers
What is the primary factor that drives the movement of particles during diffusion?
What is the primary factor that drives the movement of particles during diffusion?
Which of the following substances can diffuse across the cell membrane?
Which of the following substances can diffuse across the cell membrane?
Why is diffusion considered a passive process?
Why is diffusion considered a passive process?
How does temperature affect the rate of diffusion?
How does temperature affect the rate of diffusion?
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In gas exchange, which substances diffuse into and out of cells?
In gas exchange, which substances diffuse into and out of cells?
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What does it mean for a cell membrane to be partially permeable?
What does it mean for a cell membrane to be partially permeable?
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What is an example of a substance that leaves a cell via diffusion?
What is an example of a substance that leaves a cell via diffusion?
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Which of the following best describes the movement of particles in diffusion?
Which of the following best describes the movement of particles in diffusion?
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Study Notes
Diffusion
- Diffusion is the spreading of particles in a solution or gas.
- Particles move randomly from areas of high concentration to areas of low concentration.
- This movement is driven by kinetic energy, with higher temperatures leading to faster diffusion.
- Diffusion is a passive process.
Diffusion in Living Organisms
- Cell membranes are partially permeable, allowing some substances to pass through by diffusion.
- Oxygen and carbon dioxide can diffuse through cell membranes.
- Larger molecules like starch cannot diffuse.
Examples of Diffusion in Cells
- Oxygen diffuses into cells for aerobic respiration.
- Carbon dioxide diffuses into plant cells for photosynthesis.
- Urea diffuses out of liver cells as waste.
- Carbon dioxide diffuses out of cells during respiration.
- The movement in each case depends on a concentration gradient between the cell and its surroundings. A change in the gradient will change the direction of movement.
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Description
Explore the essential concept of diffusion and its significance in living organisms with this quiz. Understand how particles move through cell membranes and the role of diffusion in processes like respiration and photosynthesis. Test your knowledge about concentration gradients and their impact on cellular functions.
