Weight is a good guideline for blood volume in people of average build. This is why we set a minimum weight limit of 7st 12lbs (50 kg) because if more than 13% of blood volume is taken there is more risk of the donor feeling faint after donating.
Not surprisingly, the one factlet most often offered up as revealed truth is wholly false: Your hair and nails do not continue to grow after you die; it's all optical illusion. The sorry fact of the matter is that we dehydrate after dying. Our flesh dries and, in so doing, pulls away from nails and hair.
The average life of a hair is 3-5 years. In individuals who are not loosing hair, 90% hair are present most of the time on the scalp, while remaining 10% are in the process of falling and growing back. When we plucked or pull out hair, hair goes into the resting phase (telogen) and may resume Growth phase Anagen in 3-4 months.