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Describe the steps following the arrival of an action potential to the pre-synaptic bulb allowing for transmission of a signal across a synapse.

Depolarisation of plasma membrane opens voltage-gated calcium channels, allowing calcium ions to move into pre-synaptic bulb down the concentration gradientHigh intracellular calcium results in the mobilisat...
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Answered by William T. • Biology tutor
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How do I approach the source question to achieve a high level answer?

A good way to approach a source question (for AQA, for example) in order to achieve a high level answer is focusing on content and argument, tone and emphasis and provenance. In your essay you will have a pa...
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Answered by Lilah H. • History tutor
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What shape does XeF4 take?

Molecular shape depends on the number of electron pairs around the central atom. Electrons are negatively charged and so each of the electron pairs will repel each other. Lone pairs tend to repel more than b...
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Answered by Laura S. • Chemistry tutor
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Please give two examples on why deposition occurs.

Deposition can occur firstly as a result of gravity settling. This happens when the energy required to transport sediment becomes too low. Large sediment is often deposition first. Deposition can also occur ...
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Answered by Olivia W. • Geography tutor
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How can the y=sin(x) graph be manipulated?

First, lets sketch a simple y=sin(x) graph between 0 and 2Pi radians.There are 4 different places a number could be put into this equation to affect the y=sin(x) graph.y=2sin(x) will stretch the graph to be ...
Answered by • Maths tutor
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