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There is ongoing research on this topic, but there is a theory known as inhibition theory. See this from here: Directed attention fatigue occurs when a particular part of the brain’s global inhibitory system is overworked due to the suppression of increasing numbers of stimuli. This temporary condition is not a clinical illness or a personality disorder. ...


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Then I realised that it would be much more efficient to remove the bladder and let it flow into the intestines so that the fluids can be reabsorbed. No. This would be very, very bad. First, the kidney is very good at water conservation when necessary. If you're peeing up a storm, then you're drinking up a storm. It is much more efficient to flush out ...


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Think of what happens when you don't wash your hair for days. It gets oily and greasy. This oil-like substance on your hair is called sebum and mainly works as a lubricant . The Sebaceous glands responsible for excreting sebum don't stop working when the hair follicles attached to them do. The result is a "shiny" head.


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Well there are some overall, simplified answers, but every individual is ..well.. individual. First there is the ratio of volume to area. As interaction between two mediums normally is depended on their common/shared surface. If we state, that an overweight person A has more volume than a skinny person B of same height, A also has a larger surface as B, but ...


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This is a very interesting question, and one that has been at the heart of cancer research for a long time. I think it separates into three issues. Are there non-genetic mechanisms that can induce uncontrolled cell proliferation? Yes, at least in experimental settings. There are many viruses that induce proliferation in its host cell, and viral genes / ...


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As anongoodnurse has mentioned in the comments, an incomplete course can allow weakly resistant stains to expand their population. As you mentioned, the antibiotic does not cause the bacteria to mutate but it kills all strains that do not carry the mutation that provides the resistance. This mutation arises randomly (in certain cases it can be acquired by ...


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Nice question, I'll answer it in parts: Is it necessary for our body? Well, there can be many perspectives for why humans like singing. Let's talk about the evolutionary perspective first. I found three theories about why singing was evolutionarily beneficial for humans. The Shakespearean theory, that music is at least one of the foods of love, has a ...


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It is not. The result of an evolutive adaptation depends on different kinds of selective pressures. So, the solution can be more complex that you may expect and there can be more than one solution to the same problem as well. To stick with the example you made. One possible solution could be to have stronger females (note that this is true for many species ...


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Given the incidence rate of cancer, it is likely that usually multiple somewhat independent events have to occur, so that cancer forms (see the famous interpretation of the underlying data/thinking by Hanahan et Weinberg 2000 ) Epigenetic changes seem to be a likely factor contributing to cancer ( summary of an experiment, where they are also causal/inducing ...


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Many consider pubic hair to be a sort of protection or warmth, however this can only hold true for the vagina, since pubic hair doesn't offer any additional protective advantages to the male urethra. The most prevailing theory is that simply it is one of the odor producing parts of the body and humans (like most life forms in general) are simply aroused by ...


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These enzymes, while useful markers of disease, are not only produced during the disease state, and are not only produced in one organ. It is therefore not surprising that there are always low levels released into the biochemical milieu that is the blood. If there are not even low levels of the enzymes then that might indicate that the organ is not doing it'...


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To be more detailed it is the irreversibly of the reaction carried by Pyruvate dehydrogenase that makes the conversion of the fatty acid chains to glucose impossible. The fatty acids chains are converted to acetyl-CoA. Acetyl-CoA to be converted into pyruvate need an enzyme that can do the Pyruvate Dehydrogenase's inverse reaction (in humans there is no ...


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Genetic basis of height The genetic variants analysed by Wood et al. (2014) account for ~29% of the phenotypic variance and 60% of the heritability of height. Due to this high heritabilty (and the fact that there are still expected to be more unknown variants affecting height) there most likely is a genetic reason explaining the difference of height in ...


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I still take in consideration the odd that the hair growth regulation might be length based and not only time based. The hair total life cycle is certainly time based in that it will fall off and shed regardless of how much you cut it and its current length. That's why you see them especially hair, shedding of any length. They are, as stated here, at ...


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I'm not a eye doctor but I do workout. I would like to say something about your metaphor or comparison from the ciliary muscle to the body muscles. Let's look at a workout. In a workout, you strain the muscle then relax the muscle repeatedly until you exhaust the muscle. Another part of the exercise is stretching. If you don't stretch, you will lose full ...



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