If it is an unfertilized egg, the lining of the uterus will leave with the egg. Blood is discharged along with these through the cervix and out of the vagina.
This is referred to as Blood Alcohol Concentration or BAC. This is usually represented as a decimal below one. The level of this BAC also determines if you are considered driving under influence (DUI).
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It's called the backbone
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High blood pressure, cardiac arrest, arrhythmia, etc