A change in a cell's membrane potential, such that the inside of the cell becomes more positive, is referred to as a whereas if it becomes more negative it is referred to as .

A change in a cell's membrane potential, such that the inside of the cell becomes more positive, is referred to as a depolarization whereas if it becomes more negative it is referred to as hyperpolarization.

Explanation:

Depolarization is a transition in the cell where the cell experiences a move in the allocation of electric charge, culminating in less negative load within the cell. The role of many cells, cell-to-cell contact and an organism's overall physiology are important.

Hyperpolarisation is a shift in the membrane energy of a cell that makes it more negative. It is the inverse of a depolarization. While the neuron is hyperpolarized, it is in a refractory cycle that lasts approximately two milliseconds, at that time the neuron can not produce potential for action taken.

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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.