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Salt.

the receptors for table salt (NaCl) is an ion channel that allows sodium ions (Na+) to enter directly into the cell. This depolarizes it allowing calcium ions (Ca2+) to enter triggering the release of ATP at the synapse to the attached sensory neuron and generating an action potential in it. In lab animals, and perhaps in humans, the hormone aldosterone increases the number of these salt receptors. This makes good biological sense:

  • The main function of aldosterone is to maintain normal sodium levels in the body.
  • An increased sensitivity to sodium in its food would help an animal suffering from sodium deficiency.

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