Neurons are highly specialized cells which receive and transmit the signals. When the signals are not send by the neuron it is said to be at resting state. Neurons and other type of cells on the membrane contain a protein pump called sodium-potassium pump. The pump by the use of ATP pumps three sodium ions out of the cell and two potassium ions in to the cell simultaneously. These transports of ions cause the inner side of the membrane more negative since it contains higher concentration of potassium ions. This is measured as -70 milli Volts and thus the inside is more negative. During action potential, the stimuli is detected by the membrane, it changes the movement of ions thereby changes the charges.

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Chapter 27.1, Problem 2A

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Neurons are highly specialized cells which receive and transmit the signals. When the signals are not send by the neuron it is said to be at resting state. Neurons and other type of cells on the membrane contain a protein pump called sodium-potassium pump. The pump by the use of ATP pumps three sodium ions out of the cell and two potassium ions in to the cell simultaneously. These transports of ions cause the inner side of the membrane more negative since it contains higher concentration of potassium ions. This is measured as -70 milli Volts and thus the inside is more negative. During action potential, the stimuli is detected by the membrane, it changes the movement of ions thereby changes the charges.

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