So, how many eggs does a typical human female have at birth?
If you figure a woman begins menstruating at the average age of 12 and finish at the average age of 51 then that's a good 39 years between of menstruating. If you take those 39 years and say you have 12 periods (one per month, of course) each year, in which you release one egg each cycle, then that'd be about 468, right? So, are we born with 468 eggs or there about?
"Women are born with a finite number of eggs. At birth, a woman has around 1 to 2 million eggs. However, throughout her life, a woman loses eggs through a destructive process called atresia. At puberty, only around 400,000 eggs remain. Throughout the reproductive life span, from puberty until menopause, women lose about 1,000 eggs each month. Of these thousand eggs, only one is released. Once released, it is picked up by the fallopian tube. If a couple has sexual intercourse around this time, fertilization (the joining of the egg and sperm) may take place."
So, actually, we're born with one or two million eggs in our ovaries. When we go through menopause that simple means we have used those eggs up and there is nothing left to be fertilized. Some women begin menstruation earlier than others just like some women go through menopause earlier than others.
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