Category Archives: Research

Why Do Humans Menstruate?

All female placental mammals have a uterus lining (“endometrium”) that builds up when the animal is fertile. If the egg is not fertilized, most mammals reabsorb this lining into their uterus (“covert menstruation”), however a few mammals, including humans, shed this lining … Continue reading

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Can People tell when a Woman is Ovulating?

Humans have “concealed ovulation”. Concealed ovulation is the lack of any perceptible change in an adult female (for instance, a change in appearance or scent) when she is “in heat” and near ovulation.

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Light Spotting a Few Days Before Period

Over the last six months I’ve started to experience light spotting a couple of days before each period begins. The spotting is very light and is usually a brownish colour (or sometimes red).

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Stem Cells in Menstrual Fluid

Stem cells are a type of biological cell that have the potential to become any cell in the body, therefore they can be used to repair damaged tissue. Stem cells come from two main sources: embryos or adult tissues. Embryonic … Continue reading

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How many eggs do I have inside me?

A baby girl is born with 1 to 2 million oocytes (human eggs) in her ovaries. When she hits puberty all but about 300,000 will have died before becoming mature eggs. Of these, 300 to 400 will be ovulated during … Continue reading

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What does a human egg cell look like?

How big is a human egg? The human egg (or ovum or oocyte) is probably the largest single cell in the human body. Sperm cells, the other half of the reproductive equation, are much, much smaller (in fact, sperm cells are the smallest cells in … Continue reading

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Average amount of blood loss in menstruation?

35 mls (2.4 tablespoons) is the average volume of menstrual fluid lost during a cycle. However anywhere from 25–80 milliliters (1–6 tablespoons of menstrual fluid) is considered normal. Only 10% of women lose more or less than this when menstruating. The actual amount lost … Continue reading

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How many days of bleeding in an average menstrual cycle?

Menstrual bleeding lasts for between 3 to 5 days on average each cycle, however anywhere from 2 to 7 days is considered normal. The average length of menstrual bleeding increases with age. Absence of menstrual bleeding? When a woman does not have a … Continue reading

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Why doesn’t Wikipedia have any photos of menstrual fluid?

Below-right is a copy of the Diagram of Menstruation on Wikipedia’s “Menstruation” page. This is the closest Wikipedia gets to portraying “menstrual blood”. For some reason the blood is in the diagram is pink (not red). Wikipedia states that “menstrual … Continue reading

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Average Menstrual Cycle Length

Average menstrual cycle lengths: A “menstrual cycle” is the period between the first day of one’s menstrual period to the first day of the next. The normal menstrual cycle for adolescents is between 21 and 45 days. This is slightly longer … Continue reading

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