Marisa Saint Martin, MD, medical director of transfusion services at Houston Methodist, answers frequently asked questions about blood donation, its role in saving lives, and why blood donation is so crucial in every community. · How much blood can you donate at one time? · How many lives are saved from donating blood? · What to eat before blood donation? · What are the different blood types? · What makes the AB blood type the universal receiver? · What determines your blood type? · Why is blood