What physiological stage of heart does the p wave observed with ekg sensor represent?

The physiological stage the heart is in when p waves are present on an EKG is atrial contractions. These are commonly often referred to as atrial premature complexes (APC) or even atrial premature beats (APB). This is a very common cardiac dysrhythmia that is recognized by atrial heartbeats that are premature.

1) the mayans built pyramids just like the egyptians. the mayans also used hieroglyphics like them.2) power was passed down by family. for example, if the father dies, the son would be the next king.3)they both built pyramids for their structures.4)the main crop for the mayans was maize.5)they also grew manioc, beans,  squash,  amaranth, and chile peppers.