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Which one of the following statements is incorrect about menstruation?
A
At menopause in the female, there is especially abrupt increase in gonadotropic hormones
B
The beginning of the cycle of menstruation is called menarche
C
During normal menstruation about 40 ml blood is lost
D
The menstrual fluid can easily clot
Detailed Solution
Menstrual fluid consists of blood, mucus and the broken down endometrial tissue of the uterus.
Menstrual blood does not clot easily. The fibrin formed is broken down by the enzyme fibrinolysin (plasmin) released from the degenerating endometrium, so the fluid normally stays liquid.
So the statement that the menstrual fluid can easily clot is incorrect.
The first menstruation, which begins at puberty, is called menarche; this statement is correct.
About 40 ml of blood (roughly 30 to 80 ml) is lost in a normal menstruation; this statement is correct.
At menopause the ovaries stop responding and oestrogen falls, so the negative feedback on the pituitary is removed and the gonadotropins (FSH and LH) rise sharply; this statement is also correct.
Menstrual blood does not clot easily. The fibrin formed is broken down by the enzyme fibrinolysin (plasmin) released from the degenerating endometrium, so the fluid normally stays liquid.
So the statement that the menstrual fluid can easily clot is incorrect.
The first menstruation, which begins at puberty, is called menarche; this statement is correct.
About 40 ml of blood (roughly 30 to 80 ml) is lost in a normal menstruation; this statement is correct.
At menopause the ovaries stop responding and oestrogen falls, so the negative feedback on the pituitary is removed and the gonadotropins (FSH and LH) rise sharply; this statement is also correct.