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Question

Which of the following layers constitute the menstrual blood?

A
Stratum basalis
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B
Tunica vaginalis
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C
Tunica vasculosa
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D
Stratum functionalis
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Solution

The correct option is D Stratum functionalis
In human females, stratum functionalis is the outermost endometrial layer that lines the uterine cavity. It sheds off during menstruation (periodic shedding of the uterine lining in females) and forms the menstrual blood.

Stratum basalis lies inner to the stratum functionalis. It is a permanent layer and lays down a new layer of stratum functionalis after each menstrual cycle.

Tunica vaginalis and tunica vasculosa are protective internal coverings of the male gonads i.e. testes.

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