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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.

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 chara...

First, we must find the value of y when x = 2.

y = x³+4x+5 = (2)³+4(2)+5 = 21

Then we must find the gradient of the tangent line. This can be done by d...

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 ve...

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 purpo...