The answer is yes and no. The hair that is outside of your scalp is considered dead, simply because there are no blood vessels, nerves or muscles. Even though our hair is dead it, can stretch up to 30% of its length, if it’s healthy, and can also absorb its own weight in water. Our hair is also remarkable by virtue of its resilience. We color, cut, wash, brush, heat, cool, pull, tug, twist and rub our hair; and if it’s in good health, still remains intact.