Teacher Xu Wenbing tells why women's menstruation smells of blood.
Blood, secretions and sweat mixed with endometrium and sebaceous glands have obvious bloody smell. Menstrual blood is discharged from the body after the endometrium is stripped, and then passes through the cervical canal after stripping. With the shedding of cervical canal epithelium and vaginal mucosa epithelium, blood is mixed and discharged, and the smell of blood is obvious.