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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 membr...

Answered by Umraj R. • Biology tutor

4022 Views

solve x^2 >3(x+6) (4 mks)

x²>3(x+6)Firsty expand brackets --> x²>3x+18Then make one side = to 0 ---> x²-3x-18>0Solve the quadratic (x+3)(x-6)>0find the solutions when =0 x=-3 and ...

Answered by Lucy C. • Maths tutor

2487 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 mobili...

Answered by William T. • Biology tutor

2152 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...

Answered by Lilah H. • History tutor

9997 Views

What shape does XeF4 take?

Molecular shape depends on the number of electron pairs around the central atom. Electrons are negatively charged and so each of the electron pairs will repel each other. Lone pairs tend to repel more tha...

Answered by Laura S. • Chemistry tutor

9112 Views