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Describe how heart action is coordinated with reference to the SAN, AVN, and Purkyne Tissue, and explain the importance of the valves within the heart (8 marks)

The SAN (pacemaker) sends a wave of excitation across both atria . This triggers atrial systole, where both atria contract simultaneously . There is a time delay at the AV Node which allows the atria to empt...
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Answered by Octavia B. • Biology tutor
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Explain what is meant by the rate of inflation and  analyse the main causes of inflation

Inflation is a sustained increase in the general price level leading to a fall in the purchasing power or value of money. The rate of inflation is measured by the annual percentage increase in the level of c...
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Answered by Katie L. • Economics tutor
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What is a hurricane and outline the structure of a hurricane

A hurricane is a type of tropical cyclone, which is a generic term for a low pressure system that generally forms in the tropics. The cyclone is accompanied by thunderstorms and, in the Northern Hemisphere, ...
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Answered by Katie L. • Geography tutor
5107 Views

Solve the simultaneous equations algebraically

x 2 +y 2 =25 and y-3x=13Step 1 is to label the equations (1) and (2). We shall label the first equation, the quadratic, as equation (1) and the second equation, the linear, as equation (2). When solving a si...
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Answered by Andrew E. • Maths tutor
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You are given the equation y=x^2. Determine whether or not the equation has any maximums or minimums and identify them (whether they are maximums or minimums).

The question has given us a function and wants us to determine whether or not any maximums/minimums exist (and if so identify then). We know maximums/minimums occur when the derivative of the equation is equ...
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Answered by Lana M. • Maths tutor
3347 Views