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Why is an action potential an all or nothing process?

An action potential is the signal neurons use to communicate with each other. It is caused by the rapid opening of sodium channels and influx of sodium ions. Because at rest the inside of the neuron is negat...
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Answered by Gemma G. • Biology tutor
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Solve the simultaneous equations. Equation one: 4x – 3y = 7. Equation two: 4x + y = -1.

To solve this question you need to find a value of x and y which satisfies both of the equations. Simultaneous equations can be solved by three methods: substitution, elimination, and graphically. We will us...
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Answered by Emma F. • Maths tutor
9221 Views

How can you find out if two lines expressed in their vector form intersect?

Let the lines be: r 1 = (a, b, c) + t(d, e, f) r 2 = (g, h, i) + s(j, k, l) Since t and s above are variables and the rest of the letters are constants, the only way to change the point which the vector equa...
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Answered by Yordan I. • Maths tutor
4646 Views

How do you form the perfect tense, le passé composé?

the perfect tense, le passé composé, expresses completed actions in the past. It is composed of -the auxiliary verb (avoir ou être) conjugated in the present tense - followed by the past participle of the ve...
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Answered by Elena R. • French tutor
3039 Views

How to get started on an essay?

Writing an essay - whether it's for coursework submission or practice for an exam - can seem really really overwhelming sometimes. It's not as hard as it seems, if you know where to start though! First, you ...
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Answered by Lili G. • English tutor
2605 Views