A-V Valves Open; Semilunar Valves Closed. This is the first phase of the cardiac cycle. It is initiated by the P wave of the electrocardiogram (ECG), which represents electrical depolarization of the atria. Atrial depolarization initiates contraction of the atrial musculature.
Community Q&A. You can calculate age on Excel for a many applications by combining an undocumented function and the date format for cells. Microsoft Excel internally stores dates as serial numbers, which is the number of days a date is from Jan. 1, 1900.
The Microsoft Excel MONTH function returns the month (a number from 1 to 12) given a date value. The MONTH function is a built-in function in Excel that is categorized as a Date/Time Function. It can be used as a worksheet function (WS) and a VBA function (VBA) in Excel. As a worksheet function, the MONTH function can be entered as part of a formula in a cell of a worksheet.