Follicular and luteal phase lengths. â variability of menstrual cycle. attributable to follicular phase. â  Mean cycle length ranges from 27.3 to 30.1 days between ages 20 and 40 years, follicular. phase length is 13-15 days, and luteal phase length is less variable and averages. 13-14 days1-3.
Any sequence of seven successive natural notes, such as C-D-E-F-G-A-B, and any transposition thereof, is a diatonic scale. Piano keyboards are designed to play natural notes, and hence diatonic scales, with their white keys. A diatonic scale can be also described as two tetrachords separated by a whole tone.
The word chromatic actually means colourful - the scales are very colourful since they use ALL 12 different notes available instead of just 7 of them! The scales you have studied up till now-major and minor-are in a group called diatonic scales.Diatonic scales all contain 7 notes and are firmly based on a key-and the keynote, or the first note of the scale, is the TONIC. Chromatic scales are not in any particular key.he notes we have found are Eb, D, Eb, E, F. The E flat is repeated, so we should ignore the first one, which will give us four notes in total: D-Eb-E-F. These are four consecutive notes which are part of a chromatic scale.