Describe the source of electrical activity on the graph.
MY ANSWER: The opening and the closing of the valves in the heart
THE CORRECT ANSWER: S.A node
Bummer, and to my dismay my answer in a sense is correct BUT what causes the opening and the closing of the valves is what the question really wants.IS IT? Hmm... to be honest, I may be alone in this but up to this point, I still do not have a clear picture of specification needed because sometimes what we write may be exceeding what is truly needed and thus causing mistakes here and there which distrupts the whole flow of the intended answer. Then again, sometimes what we write may be lacking some critical points that we assumed not supposed to be there in the first place (which may explain why i'm able to score an A on my Paper 1 but did badly in the others). With the amount of time in an exam and all the pressure in it, it is to the utmost importance that what we answer is what the question really needs. Call me a whiner, call me a jerk if you must but be assured I'm writing this just to express my discontent at....myself actually so I don't mind what those who are reading this post is thinking. My grade? Let it be kept to myself for now, and as time passes by you will know the truth and I can assure you it's not pretty.. (T_T)