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Describe the electrical conduction system of the heart and how it initiates the heart beat

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 causes...
JM
Answered by James M. • Biology tutor
11549 Views

How do I know which nouns are feminine and masculine?

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 to ...
BE
Answered by Bryn E. • Spanish tutor
10718 Views

Find an equation of the circle with centre C(5, -3) that passes through the point A(-2, 1) in the form (x-a)^2 + (y-b)^2 = k

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 is a const...
TW
Answered by Tim W. • Maths tutor
5650 Views

How can I pronounce better in Spanish?

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 ar...
LD
Answered by Louise D. • Spanish tutor
3386 Views

What's the best way to write a history essay?

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 yo...
CM
2796 Views