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What is the difference between ser and estar and when should I use them?

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. However,...
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Answered by Maisie G. • Spanish tutor
1884 Views

Find the derivative of yx+5y-sin(y) = x

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 dy...
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Answered by Larbi E. • Maths tutor
3793 Views

How is the resting membrane potential established in a neurone?

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 membrane...
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Answered by Umraj R. • Biology tutor
4946 Views

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
2616 Views

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
11682 Views