The horizontal axis is time. The vertical axis is a measure of something electrical (the wires are connected to electrical contacts on your chest).
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EKG paper is a grid where time is measured along the horizontal axis, of EKG graph paper and where to measure the components of the EKG wave form.
horizontal lines represent latitude and vertical lines represent longitude
Parallel lines are lines that, if extended, would never intersect with eachother. This means that they are going in the same direction, eg. | |, but not | \. Horizontal means that that are going across, eg. ___________________, not |. An example of a lines that are parallel and horizontal: _____________________________________ _____________________________________
imbrication lines
Well, honey, a trapezium can have zero, one, or two horizontal lines depending on its orientation. So, technically, there can be anywhere from 0 to 2 horizontal lines in a trapezium. Hope that clears things up for ya!