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.
Some women wear headscarves, wigs, and pencil on eyebrows. There is nothing you can do to prevent hair loss during chemotherapy. However, hair loss is temporary and will start to grow back in a few months after chemotherapy treatment. Your hair may grow back with a different color, texture, or consistency. The best thing to do is let your hair grow out naturally and then think about dying, straightening, or perming it after you are completely finished with the treatment.