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How are action potentials transmitted across synapses?

When an action potential is transmitted from one neurone to another it has to be sent across a small gap - called the synapse . Firstly, the action potential arrives at the presynaptic neurone (‘pre’ means b...
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Answered by Sophie M. • Biology tutor
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Describe how a neurotransmitter, such as acetylcholine, is released from a brain cell.

When an action potential reaches the presynaptic bouton, it causes an influx of calcium into the nerve cell ending. This, in turn, causes vesicles containing the neurotransmitter (acetylcholine) to move to a...
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Answered by Zoe G. • Biology tutor
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Assess the economic and political impact of the Treaty of Versailles on the Weimar Republic between 1919 and 1924.

The effects of the Treaty of Versailles were extensive, and both political and economic in nature. Economic effects included the loss of 13% of Germany's territory, as well as 75% of its iron ore and 15% of ...
Answered by • History tutor
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Explain the international crisis sparked by the attacks on September 11 2001.

The September 11 attacks were globally seen as an act of war. President Bush declared a "War on Terror" shortly after the attacks. The Muslim world, along with the rest of the international communi...
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Answered by Shyam S. • History tutor
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Write a recursive function to return the nth Fibonacci number in Python

def fibonacci(n): if n <= 1: return n else: return fibonacci(n-1) + fibonacci(n-2)
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Answered by Finn G. • Python tutor
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