The main reason that eating salty foods makes a person thirsty is that additional fluid is needed to

to dilute the salts and maintain the balance of water

Eating salty foods make our blood saltier and the fluid outside our body cells saltier, too. The thirst center gives a signal that the body needs additional fluid to dilute the salts and maintain the balance of water inside the body. It is during this time the person starts to feel thirsty. 

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.

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