The sequence of depolarization and repolarization creates the electrical signal that triggers the contraction of the heart and the ejection of blood.   If many of the chambers contracted concurrently, then blood could not circulation with the heart because the AV valves would avert blood mov

The 3 tactics we’ll investigate are the ‘Pause and Swap’ approach to swapping filament spools, printing objects in various items, and applying rainbow filament to generate elements with a enjoyable color transition. You can also paint your design just after printing, but that will