Menstruation

1. Define menstruation.
2. List the names of four female hormones responsible for menstruation.
3. At what age does menarche occur?
4. Why does a girl need more nutritious food during the menstrual period?
5. In what case does menstruation occur?
• when sperm and ovum fuse together
• when the fertilized ovum gets implanted on endometrium layer of the uterus
• when the unfertilized ovum gets disintegrated and hormonal level in the endometrium layer drops
6. What is menopause?