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Describe the conducting system of the heart.

The pacemaker cells of the sino-atrial node in the right atrium generate an impulse.This impulse travels through the atria, causing depolarisation of cardiac muscle cells and atrial contraction.The impulse w...
CP
Answered by Calum P. • Biology tutor
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How do you use the present subjunctive and what is it?

The present subjunctive is not a new tense. It is a version of the present tense which needs to be used in certain situations. The subjunctive is used to express doubt or desire. To form the subjunctive, the...
EL
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Examine the View that Byron’s Presentation of Love is Purely Superficial

Throughout the duration of the poem, Byron employs vivid imagery in order to exaggerate the the beauty of his subject. This, combined with the lack of focus on anything beyond beauty, implies that the love p...
IL
Answered by Isabella L. • English tutor
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Factorise: 3x^2 - 9x - 30

The first think you can do is look to see if all of your terms can be divided by a common factor. In this case it is 3, leaving you with 3(x^2 - 3x - 10). This can be factorised further to produce something ...
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Answered by Freya N. • Maths tutor
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To what extent did the failure of collective security result in the policy of appeasement in the mid 1930s?

The League of Nations was set up following World War One in 1920 with a goal of maintaining peace. The League pursued a policy of Collective Security, which revolved around the idea that war should not be us...
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Answered by Caroline R. • History tutor
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