EDIT: I probably should have said why does *menstruation* last so long
I know every women is different and this doesn’t apply to everyone, but many women experience 2 heavy days, 1 medium day and then 2 extremely light days. How come our bodies can’t rid it all in 3 days instead of dragging it out into 5 with 2 almost pointless days?
In: Biology
Mine were long when I was a teen and young adult but now they last about 3 days maybe with some spotting the fourth day. So I either don’t use as much blood as I use to or my body is more efficient.
Interestingly enough other than other primates there are only a few other species of mammals that have periods. Most other animals will absorb the blood. Humans have a thicker lining than other animals because our fetuses are greedier than others and burrow deeper into the lining. The extra blood helps the mother ration nutrients so the fetus doesn’t take everything. Also humans are more likely to spontaneously miscarry it’s estimated that more than 50% of pregnancies end in miscarriage most happen before you would get your first period so you might not even realize that your pregnant except perhaps a heavier flow. The miscarriages are likely caused because the embryo was abnormal some how and the mother’s body didn’t want to waste resources bring a non-visible offspring to term. So one or both of these reasons could be why humans have periods unlike other mammals.
If you have seen a dog bleed it is not a period that is a sign of ovulation.
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