Nerve Impulse Production

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1. Stimulation of membrane affects the resting potential; Na+ ion move inward (depolarization); K+ ion move outward (repolarization); This rapid change in potential is the _____; this propagation along a nerve fiber is the nerve impulse

Action potential

Resting potential

Refractory period

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2. A polarized membrane has unequal distribution of positive and negative ions on either side of the membrane; outside has more positive charges and inside has more negative charges; Na+ is the major extra cellular positive ion and K+ is the major intracellular positive ion; the major negatively charged ions are PO-2 4 and SO4-; Na+/K+ pump exerts Na+ out of the cell K+ into the cell through the cell membrane

Central Nervous System

Cell Membrane Potential

Peripheral Nervous System

3. Neurons communicate via neurotransmitters; neurons produce at least 30 types of neurotransmitters

Neurotransmitters

Refractory period

Action potential

4. A brief period after the passage of a nerve impulse; the membrane is less or not sensitive to the next stimulation

Action potential

Resting potential

Refractory period

5. Na+ ion move out; K+ ion move in; negative ions do not move through the membrane

Action potential

Resting potential

Refractory period

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