If you use Excel 40 hours a week (and those are the weeks you are on vacation), welcome to the MrExcel channel. Home to 2,400 free Excel tutorials. Bill "MrExcel" Jelen is the author of 67 books about ...

The first sound in the phonocardiogram occurs at the time of closure of the atrioventricular valves, and has been attributed to their closure. 4 Since the atrial pressure is very close to the ...