List the events involved in an action potential.

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step 1nerve cell membranes maintains resting potential by the diffusion of Na and K down their concentration gradients as the cell pumps them up the gradientsstep 2neurons recieve stimulation, causing local potentials, which may sum to reach thresholdstep 3sodium channels in a local region of the membrane openstep 4sodium ions diffuse inward, depolarizing the membranestep 5potassium channels in the membrane openstep 6potassium ions diffuse outward, repolarizing the membranestep 7the resulting action potential causes an electric current that stimulates adjacent portions of the membranestep 8series of action potentials occurs sequentially along the length of the axon as a nerve impulses

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11