Sodium in biology mEq/liter (135 - 145 mmol/L). A serum sodium level of less than 135 mEq/L qualifies as hyponatremia, which is considered severe when the serum sodium level is below 125 mEq/L. The renin–angiotensin system and the atrial natriuretic peptide indirectly regulate the amount of signal transduction in the human central nervous system, which depends on sodium ion motion across the nerve cell membrane, in all nerves. Sodium is thus important in neuron function and osmoregulation between cells and the extracellular fluid; the distribution of sodium ions are mediated in all animals by sodium–potassium pumps, which are active transporter solute pumps, pumping
Human Element believes it is the fear that the walking dead instill in the survivors, who lead them to do unreasonable things to survive. The game focuses on the survivors more so than the zombies, "the human element", and takes place 35 years after the zombie apocalypse began. It can be played across multiple devices; an example given is that one player could play the console version for hundreds of hours, just for the action, whereas an intelligent class player, playing on a tablet, can join into the previous player's alliance and scavenge for them, and then benefit from the buffs given