Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
Question
Why is diffusion insufficient to meet the oxygen requirements of multi-cellular 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 multi-cellular organisms like humans for several reasons:
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Size: Multi-cellular organisms are much larger, so oxygen would take a long time to reach cells in the middle or deep within the body if diffusion was the only process at work.
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Complexity: Multi-cellular organisms have specialized cells and tissues that perform specific functions. These cells may have different oxygen requirements and may not be directly exposed to the external environment. Therefore, a more complex system is needed to deliver oxygen to these cells.
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High Energy Demand: Multi-cellular organisms like humans have a high metabolic rate and therefore require a large amount of oxygen. Diffusion alone is not efficient enough to meet this high demand.
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Oxygen Concentration: The concentration of oxygen in the air is not high enough to rely solely on diffusion to meet the oxygen requirements of multi-cellular organisms.
Therefore, multi-cellular organisms like humans have developed specialized systems, like the respiratory and circulatory systems, to ensure that oxygen is efficiently delivered 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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