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a) Explain how an action potential is passed across a synapse b) Label the graph below with the steps of action potential generation c) The graph shows the results of a study on two groups taking different medication, is the difference significant?

a) When an action potential arrives at the presynaptic membrane there is an influx of calcium ions which allows the vesicles containing neurotransmitter to move to and fuse with the presynaptic membrane. The...
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Answered by Catrina K. • Biology tutor
3816 Views

Prove algebraically that (4n + 1)² − (2n − 1) is an even number for all positive integer values of n.

First of all expand the brackets and simplify the expression given:(4n+1)(4n+1)-(2n-1)= 8n 2 +8n+1-2n+1= 8n 2 +6n+2= 2(4n 2 +3n+1). Since the expression can be factorised with 2, and since 4n 2 +3n+1 will al...
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Answered by Shiv M. • Maths tutor
11527 Views

If a particle of mass m is launched vertically upwards from the ground with velocity u m/s, how long will it take to return to the ground in terms of m, u and g?

Taking upwards to be positive, and using the 'suvat' equation s=ut+1/2at 2 we know that u=u, a=-g and s=0 when the particle returns to the ground. Then we solve for t: 0=ut-1/2gt 2 0=t(u-1/2gt) So the partic...
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Answered by Jackie V. • Maths tutor
3635 Views

dux Gallorum timebat ne Romani viros collem ascendentes audirent. itaque imperavit omnibus Gallis ut in itinere tacerent. ea nocte Galli tam tacite processerunt ut custodes Romani eos non conspicerent.

The leader of the Gauls was afraid that the Romans might hear the men climbing the hill.And so he ordered all the Gauls to say nothing on the journey.That night the Gauls advanced so silently that the Roman ...
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Answered by Kishan M. • Latin tutor
4902 Views

How to recognise and make the link between probability and the algebraic demands of this question?

While I doubt students will ask this exact question, think it provides the basis for what are usually the most difficult questions in GCSE papers, and students would usually be unsure where to start. My insp...
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Answered by Neeraj K. • Maths tutor
3373 Views