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What are the roles of the sinoatrial node (SAN) and the atrio-ventricular node (AVN)?

The heart muscle is myogenic and initiates a heartbeat through an electrical conduction system; both the sinoatrial node and atrio-ventricular node are essential in this mechanism. The sinoatrial node (SAN) ...
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Answered by Shelby P. • Biology tutor
51025 Views

How to draw the inverse of a function ?

There is a simple trick to drawing the inverse of a given function. First, roughly sketch the original function. This means a sketch of the general shape of the curve with some key characteristics such as it...
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Answered by Christina V. • Maths tutor
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What is the tangent line to the curve y = x^3+4x+5 at the point where x = 2?

First, we must find the value of y when x = 2. y = x 3 +4x+5 = (2) 3 +4(2)+5 = 21 Then we must find the gradient of the tangent line. This can be done by differentiating y with respect to x and substituting ...
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Answered by Oliver T. • Maths tutor
14287 Views

What events occur during the cardiac cycle?

Within the heart the atria contract creating a high pressure and squeezing blood into the ventricles. The semi lunar valves are closed so pressure within the ventricles builds up.Pressure within the ventricl...
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Answered by James H. • Biology tutor
12012 Views

What is the difference between 'por' and 'para'?

First, it should be made clear that either of these phrases can be used to mean 'for' in English. The reason we have two different words in Spanish is because they are used for slightly different purposes. '...
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Answered by Lisa I. • Spanish tutor
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