Blood carries oxygen and nutrients throughout the body, fights infections and helps heal you. Luckily, it’s a self-generating resource that can be given to others when they need it the most. One out of every three people will need a blood transfusion in their lifetime. Anything from emergency hospital procedures, to natural disasters to life-long battles of a chronic disease may prompt the need for blood — the need is ever growing, but the supply is not as constant. Donating one unit of blood at your nearest blood bank can help hospitals ensure they have the supply they need on hand.