â¢ When the axon hillock is depolarized to threshold, an action potential is generated. Voltage-gated. channels open, thereby increasing permeability of the neuron first to sodium and then to. potassium. â¢ As sodium moves rapidly into the neuron, it produces the rising phase of the action potential. â¢ As the inward movement of sodium slows and the outward movement of potassium increases, the. membrane repolarizes.
Why is 25 pound called a pony in cockney slang. Pony, in British (especially London) slang, is the term for a sum of Â£25.Possibly derived from Indian Ruppee featuring animals on their currency.hy is 25 pound called a pony in cockney slang. Pony, in British (especially London) slang, is the term for a sum of Â£25.
But none of this really explains exactly why they are known as guinea pigs. But a multitude of theories abound, some of which are closer to the truth than others. One very common misconception is that in Britain they were the closest thing you could buy to a real pig for the price of one guinea.his was over a century before the first guinea coin in Britain was even invented. This is unlikely to be the reason why guinea pigs are called guinea pigs. One more likely theory behind the name is that they were picked up by Europeans from the country of Guinea (now known as the Republic of Guinea) in West Africa.