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Explain how the cardiac muscle controls the regular beating of the heart.

Cardiac muscle is myogenic. This means signals for contraction and relaxation originate from the heart itself. The process is initiated in the sinoatrial node (SAN), located in the right atrium. The SAN i...

Answered by Christie J. • Biology tutor

2871 Views

Explain the transmission of a nerve impulse across a cholinergic synapse referring to action potentials. (6)

When an action potential reaches the terminal of a pre-synaptic cleft, voltage-gated calcium channels are stimulated to open, causing an influx of Ca+ ions in the pre-synaptic neuron. This infux of Ca+ io...

Answered by Sarah W. • Biology tutor

2191 Views

Work out the price elasticity of demand of Coca Cola when the demand rises from 1 million to 2 million following a price decrease of £1.50 to £1.35. Is this price elastic or price inelastic?

Price elasticity of demand = % change in quantity demanded / % change in price
PED = ((2m - 1m)/1m x100) / ((1.35-1.5)/1.5 x100)
PED = 100/-10PED= -10
it is price elastic since PED < -...

Answered by Nandini M. • Economics tutor

3259 Views

A.C Bradley presented an analysis of Othello as 'the most romantic figure among Shakespeare's heroes...(he) does not belong to our world'. To what extent do you agree with this view? Comment on Shakespeare's dramatic methods.

Introduction - Establish an opinion on the quotes/ Establish the two key sides of the argument. In this case the presentation of Othello as a figure who conforms to the classical Aristotle form of tragedy...

Answered by Emma R. • English Literature tutor

7770 Views

Solve the following simultaneous equations: 3x + 5y = 19 and 8x - 2y = -18. If both equations represent lines in a coordinate system, at which point do they intersect?

I. 3x + 5y = 19 II. 8x - 2y = -18 . We see that we can simplify the second equation, and we do so: II. x - y = -9. Now, we check to see which variable i...

Answered by Ninett A. • Maths tutor

3023 Views