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Transport Mechanisms in Different Organisms (20)

All organisms need to exchange oxygen and carbon dioxide with their surroundings for respiration or
in plants for photosynthesis. According to Fick's law we know that the rate of diffusion depends on
the surface area, concentration difference and distance of pathway.

The requirements for…

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tracheoles enter deep into the insects tissues, carrying air quickly and directly to every cell. At the
ends of the tracheoles oxygen diffuses directly into the cells, and carbon dioxide diffuses out, down
their concentration gradients. When the insect is at rest, water diffuses out of its cells into the…


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