Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans ?
Question
Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans ?
Solution
Diffusion is a process where molecules move from an area of high concentration to an area of low concentration. While this process works well for single-celled organisms, it is insufficient for multicellular organisms like humans for several reasons:
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Size: Multicellular organisms are much larger than single-celled organisms. This means that cells in the interior of the organism are too far away from the external environment for diffusion to effectively transport oxygen to them.
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Complexity: Multicellular organisms have specialized cells and tissues that perform specific functions. These specialized cells often have higher energy needs and therefore require a more efficient method of oxygen delivery than diffusion can provide.
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Metabolic rate: Multicellular organisms generally have a higher metabolic rate than single-celled organisms. This means they use energy (and therefore oxygen) more quickly. Diffusion is a slow process and cannot supply oxygen quickly enough to meet the demands of multicellular organisms.
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Multicellularity: In multicellular organisms, not all cells are in direct contact with the external environment. Therefore, relying on diffusion from the external environment would not be sufficient to deliver oxygen to all cells.
Therefore, multicellular organisms like humans have developed specialized systems (like the circulatory system) to transport oxygen and nutrients to all cells in the body.
Similar Questions
Why have most multicellular organisms evolved structural adaptations which maximize gas diffusion from the environment?Multiple choice question.Because direct diffusion of oxygen into each cell normally takes over 0.5 minutes.Because direct diffusion of oxygen into each cell can provide enough oxygen only if the diffusion distance is more than 0.5 mmBecause direct diffusion of oxygen into each cell can provide enough oxygen only over distances under 0.5 mm.
What limits the size of organisms that rely entirely on oxygen diffusion from the environment (and not on a transportation/exchange system of any kind)?Multiple choice question.The fact that those organisms don't have hemoglobinThe rate of oxygen diffusionThe fact that for every molecule of oxygen that comes in hundreds of CO2 molecules are producedThe thickness of the plasma membrane
1 Assertion (A): Diffusion does not meet high energy requirements of multi-cellular organismsReason (R) : Diffusion is a fast process but occurs at the surface of the body.
By creating a water current that continuously replenishes water over the respiratory surfaces, many invertebrates that lack specialized respiratory organs increase the diffusion of oxygen byMultiple choice question.maximizing the surface area for diffusion.maximizing Δp in Fick's law.decreasing the distance over which gases travel.reducing the Δp in Fick's law.
Oxygen gas enters cells by the process of ____. diffusionosmosis
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