How many CC are there in human blood?

According to scientific determination, the blood volume of a normal person is about 8% of the body weight. If the body weight is 50 kg, the blood volume is about 4000 ml. The average adult's circulating blood volume is about 5l, accounting for 7% of body weight, and the average blood donation is 200ml, which is beneficial to the renewal of human blood cells. Some people say that women live longer than men because women update their blood once a month. That makes sense. Personally, I think it is conservative not to donate 400ml for the first time, and pay more attention to rest and nutrition after donation.