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Short answer Between 62,000 and 63,500 feet (18,900 and 19,350 meters) blood begins to boil at body temperature. This altitude, referred to as the Armstrong limit, is generally considered to be the absolute limit compatible with life. At this point, humans cannot survive without pressurization measures. Background Atmospheric pressure drops at higher ...


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In general, food is not kept in any particular sequential order. The stomach has a lot of smooth muscle which churns the food, very rapidly erasing any "order" to the food. Beyond that, the stomach digests "the food in the stomach," in parallel. Whatever is in it, it digests. Now, in general, food eaten earlier will digest into chyme (the digested slurry ...


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Cells consist mainly of water and the compressibility of water is very low. Wikipedia states: The low compressibility of water means that even in the deep oceans at 4 km depth, where pressures are 40 MPa, there is only a 1.8% decrease in volume. This means that the pressure alone does not affect the size of the cells much. However, the pressure affects ...


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Blood pressure is mostly dependent on the height from the heart. Therefore, if it is below the heart it will have higher blood pressure and if it is above the heart it will have lower blood pressure. Here you are asking from two parts of body that have same height as the heart, so they will have approximately the same blood pressure. For more see: ...


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When physical damage to the cells occur a biological process called inflammation occurs. When inflammation occurs, white blood cells are rushed to the area in order to fight off any bacteria or harmful waste leakage from damaging the cells further. In order to get the white blood cells to the site of damage faster, the body induces a process called ...


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Assuming the question is in respect to neurons..in a nutshell...resting membrane potential & excitability both depend upon sodium permeability which in turn depends on potential difference of the excitable cell....now as the sodium influx is increased the minimum voltage required to increase the conductance of sodium decreases far below its normal ...


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Ca+ and Na+ are the positive charge ions (cations) circulating in your blood. When calcium declines, certain neuroreceptors detect this and let sodium into the neuron. The results in anionic blood and cationic neurons, creating a voltage differential and increased probability of neural firing. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2987630/



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