Podcast
Questions and Answers
What best describes diffusion?
What best describes diffusion?
Which of the following substances can diffuse across a cell membrane?
Which of the following substances can diffuse across a cell membrane?
What is the role of temperature in the process of diffusion?
What is the role of temperature in the process of diffusion?
What characteristic of the cell membrane allows for selective substance diffusion?
What characteristic of the cell membrane allows for selective substance diffusion?
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In the context of cellular respiration, which substance must diffuse into cells?
In the context of cellular respiration, which substance must diffuse into cells?
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Which statement about the diffusion process is true?
Which statement about the diffusion process is true?
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What is the driving force behind the diffusion of substances into and out of cells?
What is the driving force behind the diffusion of substances into and out of cells?
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During which process do liver cells excrete the waste product urea?
During which process do liver cells excrete the waste product urea?
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Study Notes
Diffusion
- Definition: Diffusion is the spreading out of particles (in a solution or gas) from an area of higher concentration to an area of lower concentration, driven by random particle movement. Particles move net from high to low concentration.
- Mechanism: Particles are constantly moving randomly. Higher concentration = more particles = more movement from that area, and vice versa.
- Passive Process: Diffusion is passive, relying on the kinetic energy of particles. Higher temperatures mean faster particle movement, thus faster diffusion.
- Cell Membranes: Cell membranes are partially permeable; some substances can pass through them by diffusion, others cannot.
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Examples of diffusion in organisms:
- Oxygen diffuses into cells for respiration.
- Carbon dioxide diffuses into plant cells for photosynthesis.
- Urea (waste product) diffuses out of liver cells.
- Carbon dioxide diffuses out of cells.
- Concentration Gradients: Diffusion is driven by the concentration gradient between the cell and its environment. If the gradient changes so will the direction of diffusion.
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Description
Explore the concept of diffusion, the passive process where particles spread from areas of high concentration to low concentration. Understand how temperature affects diffusion rates and the role of cell membranes in this process. The quiz also covers real-life examples of diffusion in living organisms.
