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At the axon terminal of a motor neurone, an action potential arrives and triggers an influx of calcium ions. These calcium ions cause vesicles containing Acetylcholine (a neurotransmitter that works on ch...

According to the spec. You must note that Description (A01) is worth less than Evaluation (A03). Therefore you should try to divide up the proposed points with that in mind. (2 Marks for Describe and 4 fo...

Osmosis is the movement of water molecules from an area of high concentration to an area of low concentration. This is done through a semi-permeable membrane. The aim is to have the same concentration of ...

As you go down group 1, the number of electron shells increases. This means that the outer electron is further from the attractive pull of the nucleus, and it experiences more shielding from the nucleus’ ...

The general structure of a history essay should follow a similar pattern, in that it will start with a brief introduction outlining the general argument of the essay, and then move onto a series of points...