Well, TVs, on the other hand, have historically used the vertical to describe resolution (going back to the glass tube days). So 1080p is the vertical resolution. Nearly all HDTVs have an aspect ratio of 1.78:1 (16x9, aka widescreen), so that means a horizontal resolution of 1,920 pixels (1,920x1,080).
So day one of the menstrual cycle is the first of full bleeding day of the period. A typical cycle is approximately 24 to 35 days (average 28 days for most women). It is not abnormal for a womanÂ¹s cycle to occasionally be shorter or longer. On Day 1 of the menstrual cycle, estrogen and progesterone levels are low. Low levels of estrogen and progesterone signal the pituitary gland to produce Follicle Stimulating Hormone (FSH). FSH begins the process of maturing a follicle (fluid-filled sac in the ovary containing an egg).
Estrogen levels vary on a day-to-day basis during different cycles in the menstrual period as well as during normal stages of female development, so there is no single estrogen level considered normal, according to WebMD. Estrogen levels rise during puberty and a healthy pregnancy and fall during menopause. Continue Reading.