- A nerve can convert a stimulus to an impulse. The impulse travels down the myelinated axon to the synapse, where the impulse will be transmitted to the dendrite of another nerve cell

- A difference in charge resulting from ion-concentration differences causes a voltage gradient between the inside and outside of the nerve cell. The membrane potential, or voltage difference across the membrane of a resting neuron, is typically –70mV. - Notice in the diagram to the left that the outside of the cell has a higher sodium ion (Na+) and chloride ion (Cl) concentration than the inside, and that the inside of the neuron has a much higher potassium ion (K+) concentration than the outside. - The sodium-potassium ATP pump maintains the difference in ion concentration across the membrane of a nerve cell. This pump uses energy from ATP to pump Na+ out of the cell and K+ into the cell. For every three Na+ that are pumped out, two K+ are pumped in. - K+ (symbolized by squares) constantly diffuses out of the cell, and Na+ (symbolized by circles) diffuses into the cell. Notice that more K+ flows out of the cell than a+ flows in.

Which of the following ions is involved in generating an action potential of a neuron?

- sodium ion - chloride ion - potassium ion - All of these are involved in generating an action potential of a neuron.

A membrane potential is

- the difference in charge between the inside of a cell and its exterior. - the voltage measured across the plasma membrane. - generally in the range of −50 to −100 in a nerve cell at rest.

Stimuli are conducted down the axon of the nerve cell to the synaptic terminal by

- sequential depolarizations and action potentials

The negative charge on the inside of the neuron is mostly maintained by

- large negatively-charged proteins.

12.14.1 Human Regulation: The Nerve Impulse: General Events Flashcards by Irina Soloshenko

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12.14.1 Human Regulation: The Nerve Impulse: General Events Flashcards

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