Biology – 3.1 Diffusion | e-Consult
3.1 Diffusion (1 questions)
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Diffusion is the net movement of particles from a region of high concentration to a region of low concentration. Several factors influence the rate of diffusion:
- Surface Area: A larger surface area allows for more particles to diffuse across the membrane simultaneously, increasing the overall rate. For example, in the lungs, alveoli have a vast surface area to facilitate rapid oxygen diffusion into the blood.
- Concentration Gradient: The steeper the concentration gradient (the greater the difference in concentration), the faster the rate of diffusion. A larger difference in concentration drives particles more rapidly from the high concentration area to the low concentration area.
- Temperature: Higher temperatures increase the kinetic energy of particles. This means particles move faster and collide more frequently, leading to a faster rate of diffusion. However, very high temperatures can damage biological molecules, so there's an optimal temperature range.
- Distance: The shorter the distance the particles need to travel, the faster the rate of diffusion. The time it takes for particles to diffuse is inversely proportional to the distance.
These factors often work together. For instance, a larger surface area with a steep concentration gradient and a moderate temperature will result in the fastest rate of diffusion.