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Which one of the following statements is incorrect about menstruation?

1. During normal menstruation about 40 ml blood is lost
2. The menstrual fluid can easily clot
3. At menopause in the female, there is especially abrupt increase in gonadotropic hormones
4. The beginning of the cycle of menstruation is called menarche

Correct answer: The menstrual fluid can easily clot

Solution

Menstrual fluid usually does not clot easily because it contains fibrinolysin and other factors from the endometrium that prevent clot formation. The other statements are generally correct: average blood loss is about 40 mL, menopause is associated with increased gonadotropins, and the first menstruation is called menarche.

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