What Happens on the Tongue
A big part of the reason science ignored taste for so long is because it’s incredibly complicated. Not only are there thousands of flavor receptors, known as papillary cells, on the tongue, each one functions as its own little multi-functional unit.
Certainly some progress had been made observing flavor and receptor interactions over the years. The sensations of sour and salty for example. Researchers had long known that those flavors are created by hydrogen and sodium ions delivering minute electrical charges directly to papillary cell membranes. Those charges, which are received by the cell and carried along to nerve endings, can be measured.
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