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The sinoatrial node (SAN) is the pacemaker of the heart and initiates a wave of excitation (impulse) at a regular interval. This wave of excitation sweeps across the walls of the atria and in doing so cau...

Firstly, nearly all nouns ending in "a" are feminine, so if you are not sure it's a safe bet that it's feminine. There a few exceptions (mapa, systema, programa, etc.), which you will just have ...

step 1 remember than the a and b terms locate the centre of the circle on the axis so we can substitute in the centre values for a and b. (x-5)^2 + (y-(-3))^2 = k. (x-5)^2 + (y+3)^2 = k.

Step 2. k ...

Spanish is written phonetically so this makes it somewhat easier to pronounce than English. However, there are still some differences. We can start with the vowels. In English, we have A E I O U, and they...

I think the key is to be argumentative, the structure you're given is more of a guide than a rule - essentially, you need to have an opinion, state that opinion and provide all the evidence for that; then...