Why does your body expel blood during your period instead of just the uterus lining? Where is the bleeding coming from? - Quora

What Does Black Period Blood Mean? Reasons For Black Discharge

Heavy periods and retrograde bleeding - Noigroup

How does the uterus work in a postmenopausal woman? - Quora

What are the different uterus types? - Quora

Why does it take multiple days for menstrual blood to empty from a uterus? What would happen if it all came out at once? - Quora

Where does the period blood go during pregnancy? - Quora

From which opening of a woman's body is menstruation released? - Quora

What does it feel like to bleed on your period? - Quora

Why does the stomach feel pain during mensuration? - Quora

How can menstruation happen even after a tubectomy if the ovum cannot reach the uterus? - Quora