The inner lining of the uterus, which thickens each cycle and is shed during menstruation, is the
- A. perimetrium
- B. endometrium
- C. myometrium
- D. cervix
Explanation
The endometrium is the hormonally responsive layer where the embryo implants. The myometrium is the muscular wall that contracts in labour and the perimetrium the outer covering, so only the endometrium is shed in menstruation.