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Describe and explain how an action potential is generated (6 marks)

The membrane is at resting potential, -60mV inside compared to outside. It is polarised . 2. Na+ ion channels open and some Na+ ions diffuse into the neurone. 3. The membrane depolarises - it become less neg...
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Answered by Rokshan E. • Biology tutor
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Use implicit differentiation to find dy/dx of: 2(x^2)y + 2x + 4y - cos((pi)y) = 17

Tackle this problem one part at a time: First differentiate 2x 2 y using the product rule, showing dy/dx(2x 2 y) = 4xy + 2x 2 (dy/dx). After this, the remainder of the question is easier, as there are no mor...
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Answered by Nick E. • Maths tutor
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What is the difference between EMF and Voltage?

EMF stands for the Electromotive Force and it can be defined in a few ways: 1. It's the potential across the terminal ends of a cell. 2. Or in other words, the amount of energy that is given to a charge in i...
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Answered by Francisco G. • Physics tutor
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Solve x^2+2x-4, leaving your answer in the simplist surd form. (4marks)

Simplist surd form means use Quadratic equation Write out Quadratic equation Write out value of a, b and c Fit these values into equation Now the maths starts. Area's where students are likely to make mistak...
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Answered by Desnie R. • Maths tutor
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What is pathetic fallacy?

Pathetic fallacy is a literary technique in which human emotions are personified in inanimate objects, typically in weather. For example in a section of Macbeth it is a particularly stormy night, the thunder...
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