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Firstly, it is important not to get too worried as the answers will always be in the text. By jotting down a few notes for every three to four sentences whilst you read the text, you can easily look back ...

The sino-atrial node (SAN) is located within the wall of the right atrium, and acts like a pacemaker (it instigates the rhythms of the heart). The SAN sends out regular waves of electrical activity along ...

This painting presented a clear challenge to the typical academic female nude. The conventional female nude was Classically modelled, with an even, well proportioned, alluring feminine body, of the type t...

Newton's second law, F=ma, describes the relationship between an external force on an object F, the mass of the object m and the resulting acceleration of the object a. We can see that the acceleration of...

Thinking of sine and cosine as ratios of side lengths in a right angled triangle, sin(x) = o/h and cos(x) = a/h, so the sin(x)^2 + cos(x)^2 becomes (o^2 + a^2)/h^2. By Pyhtagoras, o^2 + a^2 = h^2, so we g...