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 main reason is that skin is alive and hair is dead. Melanin is the dark brown pigment produced by your skin to absorb some of the UV radiation from the sun. The melanin iâ¦n your hair is destroyed by sun and your hair will not produce more melanin to respond to that since it is dead. Your hair will stay lighter until new hair grows in.