Why is the use of iodised salt advisable ?

Explanation

a] lodine is necessary for the thyroid gland to produce thyroxine hormone. Thyroxine regulates the metabolism of carbohydrate, protein and fat in the body to provide the best balance for growth. Deficiency of iodine in our diet causes goiter. Symptom is swelling of neck.
b] The information acquired at the end of the dendrite tip of a neuron sets off a chemical reaction which creates an electrical impulse. The impulse travels from the dendrite to the cyton along the axon to its end. At the end of the axon, the electrical impulse sets off the release of some chemicals which cross the synapse and start a similar electrical impulse in a dendrite of the next neuron. in this way, nerve impulse travels in the body.