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 HOUR function returns the hours (a number from 0 to 23) from a time value. The HOUR 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 HOUR function can be entered as part of a formula in a cell of a worksheet. As a VBA function, you can use this function in macro code that is entered through the Microsoft Visual Basic Editor.