LondonJohn
Penultimate Amazing
- Joined
- May 12, 2010
- Messages
- 21,464
Do you know this for a fact? That there aren't for example higher concentrations of estrogen or other hormones in menstrual blood? I would like to read some expert citations one way or another.
Blood constantly flows around the body. Hormones are signals which are placed into the blood by certain organs, but which travel around the entire circulatory system in order to communicate with the endocrine system and the brain. If you draw blood from a woman's uterus area and her arm at the same point in time, it will contain the same levels of all hormones (and everything else bar glucose levels and oxygenation levels)