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The sinoatrial node (SAN) sends a wave of electrical activity across the atria causing atrial contraction. The non-conducting tissue stops the immediate contraction of the ventricles. The atrioventricular...

The imperfect is used when referring to description, a constant state of mind, an interrupted action, an action that has no indication of when it started or ended and an action that was done in the pas...

To prove that (2n+3)²-(2n-3)² is a multiple of 8 we are going to deal with the first bracket and then the second bracket. When a bracket has ² next to it, this means that ...

1)Take the inverse sin to take x from the sin(2x):

2x=arcsin(0.5).

2)Evaluate arcsin(0.5) to get pi/6:

so 2x= pi/6

3)Dividing by 2 to simp...

We know childhood as the time we spend as an infant when we are dependent on our parents and naïve to ‘adult’ concepts such as sex, war and suffering.

A social construct ...