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Both are translated as 'to be', but ser is generally used for permanent qualities, whereas estar is normally used for temporary conditions or states- this is ideal to use as a general rule of thumb. Howev...

When differentiating an expression of x and y we can use implicit differentiation when terms contain the y variable, recall that this is essentially differentiating the y term by y and then multiplying by...

The membrane of an axon consists of three main protein channels: the sodium/potassium pumps, voltage-gated sodium channels and voltage-gated potassium channels. These play a role in establishing the membr...

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 mobili...

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...